diff --git a/css/css.css b/css/css.css
index 31b5028..6b71de8 100644
--- a/css/css.css
+++ b/css/css.css
@@ -1,5 +1,10 @@
 html, body {
   font-size: 16px;
+  line-height: 1.5;
+  color: #888888;
+  background-color: #060606;
+  margin: 0;
+  word-break: break-word;
 }
 
 .grid {
@@ -121,7 +126,22 @@ div {
   color: white;
 }
 
+button {
+  font: inherit;
+  font-family: inherit;
+  color: inherit;
+}
+
 .btn {
+  border: 1px solid transparent;
+  background-color: #424242;
+  font-size: 1em;
+  line-height: 1.5em;
+  white-space: normal;
+  cursor: pointer;
+  padding: 8px 12px;
+  border-radius: 4px;
+  padding-left: 2.5em;
   margin: 8px;
   display: inline-block;
   vertical-align: middle;
@@ -132,7 +152,6 @@ div {
   backface-visibility: hidden;
   -moz-osx-font-smoothing: grayscale;
   position: relative;
-  padding-left: 2.5em;
   -webkit-transition-duration: 0.3s;
   transition-duration: 0.3s;
 }
diff --git a/index.html b/index.html
index 24b6395..ac83130 100644
--- a/index.html
+++ b/index.html
@@ -71,7 +71,7 @@
 
     <!-- Basic structure of an FFmpeg command -->
     <span data-toggle="collapse" data-target="#basic-structure">
-      <button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Basic structure of an FFmpeg command">Basic structure of an FFmpeg command</button>
+      <button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Basic structure of an FFmpeg command">Basic structure of an FFmpeg command</button>
     </span>
     <div id="basic-structure" class="collapse">
       <h3>Basic structure of an FFmpeg command</h3>
@@ -97,7 +97,7 @@
   <h2 id="concepts">Learn about more advanced FFmpeg concepts</h2>
 
   <!-- Filtergraph explanation -->
-  <span data-toggle="collapse" data-target="#filtergraphs"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Filtergraphs">Filtergraphs</button></span>
+  <span data-toggle="collapse" data-target="#filtergraphs"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Filtergraphs">Filtergraphs</button></span>
   <div id="filtergraphs" class="collapse">
     <h3>Filtergraphs</h3>
     <p class="link"></p>
@@ -130,7 +130,7 @@
   <h2 id="rewrap">Change container (rewrap)</h2>
 
   <!-- Basic rewrap command -->
-  <span data-toggle="collapse" data-target="#basic-rewrap"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Basic rewrap command">Basic rewrap command</button></span>
+  <span data-toggle="collapse" data-target="#basic-rewrap"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Basic rewrap command">Basic rewrap command</button></span>
   <div id="basic-rewrap" class="collapse">
     <h3>Rewrap a file</h3>
     <p class="link"></p>
@@ -153,7 +153,7 @@
   <!-- End Basic rewrap command -->
 
   <!-- MKV to MP4 -->
-  <span data-toggle="collapse" data-target="#mkv_to_mp4"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Convert Matroska (MKV) to MP4">MKV to MP4</button></span>
+  <span data-toggle="collapse" data-target="#mkv_to_mp4"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Convert Matroska (MKV) to MP4">MKV to MP4</button></span>
   <div id="mkv_to_mp4" class="collapse">
     <h3>MKV to MP4</h3>
     <p class="link"></p>
@@ -178,7 +178,7 @@
   <h2 id="transcode">Change codec (transcode)</h2>
 
   <!-- Transcode to ProRes -->
-  <span data-toggle="collapse" data-target="#to_prores"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transcode to deinterlaced Apple ProRes LT">Transcode to ProRes</button></span>
+  <span data-toggle="collapse" data-target="#to_prores"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transcode to deinterlaced Apple ProRes LT">Transcode to ProRes</button></span>
   <div id="to_prores" class="collapse">
     <h3>Transcode into a deinterlaced Apple ProRes LT</h3>
     <p class="link"></p>
@@ -209,7 +209,7 @@
   <!-- ends Transcode to ProRes -->
 
   <!-- Transcode to H.264 -->
-  <span data-toggle="collapse" data-target="#transcode_h264"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transcode to an H.264 access file">Transcode to H.264</button></span>
+  <span data-toggle="collapse" data-target="#transcode_h264"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transcode to an H.264 access file">Transcode to H.264</button></span>
   <div id="transcode_h264" class="collapse">
     <h3>Transcode to H.264</h3>
     <p class="link"></p>
@@ -236,7 +236,7 @@
   <!-- ends Transcode to H.264 -->
 
   <!-- H.264 from DCP -->
-  <span data-toggle="collapse" data-target="#dcp_to_h264"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transcode from DCP to an H.264 access file">H.264 from DCP</button></span>
+  <span data-toggle="collapse" data-target="#dcp_to_h264"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transcode from DCP to an H.264 access file">H.264 from DCP</button></span>
   <div id="dcp_to_h264" class="collapse">
     <h3>H.264 from DCP</h3>
     <p class="link"></p>
@@ -262,7 +262,7 @@
   <!-- ends H.264 from DCP -->
 
   <!-- Transcode to FFV1.mkv -->
-  <span data-toggle="collapse" data-target="#create_FFV1_mkv"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transcode your file with the FFV1 Version 3 Codec in a Matroska container">Create FFV1.mkv</button></span>
+  <span data-toggle="collapse" data-target="#create_FFV1_mkv"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transcode your file with the FFV1 Version 3 Codec in a Matroska container">Create FFV1.mkv</button></span>
   <div id="create_FFV1_mkv" class="collapse">
     <h3>Create FFV1 Version 3 video in a Matroska container with framemd5 of input</h3>
     <p class="link"></p>
@@ -288,7 +288,7 @@
   <!-- ends Transcode to FFV1.mkv-->
 
   <!-- Rip DVD -->
-  <span data-toggle="collapse" data-target="#dvd_to_file"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Basic DVD to file conversion">Convert DVD to H.264</button></span>
+  <span data-toggle="collapse" data-target="#dvd_to_file"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Basic DVD to file conversion">Convert DVD to H.264</button></span>
   <div id="dvd_to_file" class="collapse">
     <h3>Convert DVD to H.264</h3>
     <p class="link"></p>
@@ -320,7 +320,7 @@
   <!-- ends rip DVD -->
 
   <!-- Transcode to H.265 -->
-  <span data-toggle="collapse" data-target="#transcode_h265"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transcode to an H.265/HEVC MP4">Transcode to H.265/HEVC</button></span>
+  <span data-toggle="collapse" data-target="#transcode_h265"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transcode to an H.265/HEVC MP4">Transcode to H.265/HEVC</button></span>
   <div id="transcode_h265" class="collapse">
     <h3>Transcode to H.265/HEVC</h3>
     <p class="link"></p>
@@ -350,7 +350,7 @@
   <!-- Here comes audio-only transcoding -->
 
   <!-- WAV to MP3 -->
-  <span data-toggle="collapse" data-target="#wav_to_mp3"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Convert WAV to MP3">WAV to MP3</button></span>
+  <span data-toggle="collapse" data-target="#wav_to_mp3"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Convert WAV to MP3">WAV to MP3</button></span>
   <div id="wav_to_mp3" class="collapse">
     <h3>WAV to MP3</h3>
     <p class="link"></p>
@@ -375,7 +375,7 @@
   <!-- ends WAV to MP3 -->
 
   <!-- WAV to AAC/MP4 -->
-  <span data-toggle="collapse" data-target="#wav_to_mp4"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Convert WAV to AAC/MP4">WAV to AAC/MP4</button></span>
+  <span data-toggle="collapse" data-target="#wav_to_mp4"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Convert WAV to AAC/MP4">WAV to AAC/MP4</button></span>
   <div id="wav_to_mp4" class="collapse">
     <h3>WAV to AAC/MP4</h3>
     <p class="link"></p>
@@ -399,7 +399,7 @@
   <h2 id="properties">Change video properties</h2>
 
   <!-- 4:3 to 16:9 -->
-  <span data-toggle="collapse" data-target="#SD_HD"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transform 4:3 aspect ratio into 16:9 with pillarbox">4:3 to 16:9</button></span>
+  <span data-toggle="collapse" data-target="#SD_HD"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transform 4:3 aspect ratio into 16:9 with pillarbox">4:3 to 16:9</button></span>
   <div id="SD_HD" class="collapse">
     <h3>Transform 4:3 aspect ratio into 16:9 with pillarbox</h3>
     <p class="link"></p>
@@ -417,7 +417,7 @@
   <!-- ends 4:3 to 16:9 -->
 
   <!-- 16:9 to 4:3 -->
-  <span data-toggle="collapse" data-target="#HD_SD"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transform 16:9 aspect ratio video into 4:3 with letterbox">16:9 to 4:3</button></span>
+  <span data-toggle="collapse" data-target="#HD_SD"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transform 16:9 aspect ratio video into 4:3 with letterbox">16:9 to 4:3</button></span>
   <div id="HD_SD" class="collapse">
     <h3>Transform 16:9 aspect ratio video into 4:3 with letterbox</h3>
     <p class="link"></p>
@@ -436,7 +436,7 @@
   <!-- ends 16:9 to 4:3 -->
 
   <!-- SD to HD -->
-  <span data-toggle="collapse" data-target="#SD_HD_2"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transform SD to HD with pillarbox">SD to HD</button></span>
+  <span data-toggle="collapse" data-target="#SD_HD_2"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transform SD to HD with pillarbox">SD to HD</button></span>
   <div id="SD_HD_2" class="collapse">
     <h3>Transform SD into HD with pillarbox</h3>
     <p class="link"></p>
@@ -459,7 +459,7 @@
   <!-- ends SD to HD -->
 
   <!-- Change display aspect ratio without re-encoding video-->
-  <span data-toggle="collapse" data-target="#change_DAR"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Change display aspect ratio without re-encoding">Change Display Aspect Ratio</button></span>
+  <span data-toggle="collapse" data-target="#change_DAR"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Change display aspect ratio without re-encoding">Change Display Aspect Ratio</button></span>
   <div id="change_DAR" class="collapse">
     <h3>Change Display Aspect Ratio without reencoding video</h3>
     <p class="link"></p>
@@ -475,7 +475,7 @@
   <!-- ends Change display aspect ratio without re-encoding video -->
 
   <!-- Convert colourspace -->
-  <span data-toggle="collapse" data-target="#convert-colourspace"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Convert colourspace of video">Convert colourspace</button></span>
+  <span data-toggle="collapse" data-target="#convert-colourspace"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Convert colourspace of video">Convert colourspace</button></span>
   <div id="convert-colourspace" class="collapse">
     <h3>Transcode video to a different colourspace</h3>
     <p class="link"></p>
@@ -528,7 +528,7 @@
 
 
   <!-- Modify speed -->
-  <span data-toggle="collapse" data-target="#modify_speed"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Modify image and sound speed">Modify speed</button></span>
+  <span data-toggle="collapse" data-target="#modify_speed"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Modify image and sound speed">Modify speed</button></span>
   <div id="modify_speed" class="collapse">
     <h3>Modify image and sound speed</h3>
     <p class="link"></p>
@@ -551,7 +551,7 @@
   <!-- ends Modify speed -->
 
   <!-- Make stream properties explicate -->
-  <span data-toggle="collapse" data-target="#clarify_stream"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Clarify stream properties">Set stream properties</button></span>
+  <span data-toggle="collapse" data-target="#clarify_stream"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Clarify stream properties">Set stream properties</button></span>
   <div id="clarify_stream" class="collapse">
     <h3>Set stream properties</h3>
     <p class="link"></p>
@@ -591,7 +591,7 @@
   <h2 id="join-trim">Join, trim, or excerpt a video</h2>
 
   <!-- Join files together -->
-  <span data-toggle="collapse" data-target="#join_files"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Join (concatenate) two or more files into a single file">Join files together</button></span>
+  <span data-toggle="collapse" data-target="#join_files"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Join (concatenate) two or more files into a single file">Join files together</button></span>
   <div id="join_files" class="collapse">
     <h3>Join files together</h3>
     <p class="link"></p>
@@ -617,7 +617,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Join files together -->
 
   <!-- Split file into segments -->
-  <span data-toggle="collapse" data-target="#segment_file"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Split one file into several smaller segments">Split file into segments</button></span>
+  <span data-toggle="collapse" data-target="#segment_file"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Split one file into several smaller segments">Split file into segments</button></span>
   <div id="segment_file" class="collapse">
     <h3>Split file into segments</h3>
     <p class="link"></p>
@@ -647,7 +647,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Split file into segments -->
 
   <!-- Trim -->
-  <span data-toggle="collapse" data-target="#trim"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Trim video">Trim video</button></span>
+  <span data-toggle="collapse" data-target="#trim"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Trim video">Trim video</button></span>
   <div id="trim" class="collapse">
     <h3>Trim a video without re-encoding</h3>
     <p class="link"></p>
@@ -673,7 +673,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Trim -->
 
   <!-- Excerpt from beginning -->
-  <span data-toggle="collapse" data-target="#excerpt_from_start"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create an excerpt, starting from the beginning of the file">Excerpt from beginning</button></span>
+  <span data-toggle="collapse" data-target="#excerpt_from_start"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create an excerpt, starting from the beginning of the file">Excerpt from beginning</button></span>
   <div id="excerpt_from_start" class="collapse">
     <h3>Excerpt from beginning</h3>
     <p class="link"></p>
@@ -691,7 +691,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Excerpt from beginning -->
 
   <!-- Excerpt to end -->
-  <span data-toggle="collapse" data-target="#excerpt_to_end"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create a new video file with the first five seconds trimmed off the original">Excerpt to end</button></span>
+  <span data-toggle="collapse" data-target="#excerpt_to_end"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create a new video file with the first five seconds trimmed off the original">Excerpt to end</button></span>
   <div id="excerpt_to_end" class="collapse">
     <h3>Excerpt to end</h3>
     <p class="link"></p>
@@ -709,7 +709,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Excerpt to end -->
 
   <!-- Excerpt from end -->
-  <span data-toggle="collapse" data-target="#excerpt_from_end"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create a new video file with the final five seconds of the original">Excerpt from end</button></span>
+  <span data-toggle="collapse" data-target="#excerpt_from_end"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create a new video file with the final five seconds of the original">Excerpt from end</button></span>
   <div id="excerpt_from_end" class="collapse">
     <h3>Excerpt from end</h3>
     <p class="link"></p>
@@ -731,7 +731,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="interlacing">Work with interlaced video</h2>
 
   <!-- NTSC to H.264 -->
-  <span data-toggle="collapse" data-target="#ntsc_to_h264"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Upscaled, pillar-boxed HD H.264 access files from SD NTSC source">NTSC to H.264</button></span>
+  <span data-toggle="collapse" data-target="#ntsc_to_h264"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Upscaled, pillar-boxed HD H.264 access files from SD NTSC source">NTSC to H.264</button></span>
   <div id="ntsc_to_h264" class="collapse">
     <h3>Upscaled, Pillar-boxed HD H.264 Access Files from SD NTSC source</h3>
     <p class="link"></p>
@@ -754,7 +754,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends NTSC to H.264 -->
 
   <!-- Deinterlace video -->
-  <span data-toggle="collapse" data-target="#deinterlace"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Deinterlace video">Deinterlace video</button></span>
+  <span data-toggle="collapse" data-target="#deinterlace"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Deinterlace video">Deinterlace video</button></span>
   <div id="deinterlace" class="collapse">
     <h3>Deinterlace a video</h3>
     <p class="link"></p>
@@ -788,7 +788,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Deinterlace video -->
 
   <!-- Inverse telecine -->
-  <span data-toggle="collapse" data-target="#inverse-telecine"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Inverse telecine video">Inverse telecine</button></span>
+  <span data-toggle="collapse" data-target="#inverse-telecine"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Inverse telecine video">Inverse telecine</button></span>
   <div id="inverse-telecine" class="collapse">
     <h3>Inverse telecine a video file</h3>
     <p class="link"></p>
@@ -818,7 +818,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Inverse telecine -->
 
   <!-- Set field order -->
-  <span data-toggle="collapse" data-target="#set_field_order"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Set field order for interlaced video">Set field order</button></span>
+  <span data-toggle="collapse" data-target="#set_field_order"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Set field order for interlaced video">Set field order</button></span>
   <div id="set_field_order" class="collapse">
     <h3>Change field order of an interlaced video</h3>
     <p class="link"></p>
@@ -834,7 +834,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Set field order -->
 
   <!-- Check interlacement  -->
-  <span data-toggle="collapse" data-target="#check_interlacement"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Identify interlacement patterns in a video file">Check interlacement </button></span>
+  <span data-toggle="collapse" data-target="#check_interlacement"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Identify interlacement patterns in a video file">Check interlacement </button></span>
   <div id="check_interlacement" class="collapse">
     <h3>Check video file interlacement patterns</h3>
     <p class="link"></p>
@@ -854,7 +854,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="filters-scopes">Use filters or scopes</h2>
 
   <!-- abitscope -->
-  <span data-toggle="collapse" data-target="#abitscope"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Audio Bitscope">Audio Bitscope</button></span>
+  <span data-toggle="collapse" data-target="#abitscope"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Audio Bitscope">Audio Bitscope</button></span>
   <div id="abitscope" class="collapse">
     <h3>Creates a visualization of the bits in an audio stream</h3>
     <p class="link"></p>
@@ -876,7 +876,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends abitscope -->
 
   <!-- astats -->
-  <span data-toggle="collapse" data-target="#astats"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Play a graphical output showing decibel levels of an input file">Graphic for audio</button></span>
+  <span data-toggle="collapse" data-target="#astats"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Play a graphical output showing decibel levels of an input file">Graphic for audio</button></span>
   <div id="astats" class="collapse">
     <h3>Plays a graphical output showing decibel levels of an input file</h3>
     <p class="link"></p>
@@ -904,7 +904,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends astats -->
 
   <!-- BRNG -->
-  <span data-toggle="collapse" data-target="#brng"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Identify pixels out of broadcast range">Broadcast Range</button></span>
+  <span data-toggle="collapse" data-target="#brng"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Identify pixels out of broadcast range">Broadcast Range</button></span>
   <div id="brng" class="collapse">
     <h3>Shows all pixels outside of broadcast range</h3>
     <p class="link"></p>
@@ -928,7 +928,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends BRNG -->
 
   <!-- Vectorscope -->
-  <span data-toggle="collapse" data-target="#vectorscope"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Vectorscope from video to screen">Vectorscope</button></span>
+  <span data-toggle="collapse" data-target="#vectorscope"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Vectorscope from video to screen">Vectorscope</button></span>
   <div id="vectorscope" class="collapse">
     <h3>Plays vectorscope of video</h3>
     <p class="link"></p>
@@ -949,7 +949,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Vectorscope -->
 
   <!--Side by Side Videos/Temporal Difference Filter-->
-  <span data-toggle="collapse" data-target="#tempdif"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Play two videos side by side while applying the temporal difference filter to both">Side by Side Videos/Temporal Difference Filter</button></span>
+  <span data-toggle="collapse" data-target="#tempdif"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Play two videos side by side while applying the temporal difference filter to both">Side by Side Videos/Temporal Difference Filter</button></span>
   <div id="tempdif" class="collapse">
     <h3>This will play two input videos side by side while also applying the temporal difference filter to them</h3>
     <p class="link"></p>
@@ -982,7 +982,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="metadata">View or strip metadata</h2>
 
   <!-- Pull specs -->
-  <span data-toggle="collapse" data-target="#pull_specs"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Pull specs from video file">Pull specs</button></span>
+  <span data-toggle="collapse" data-target="#pull_specs"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Pull specs from video file">Pull specs</button></span>
   <div id="pull_specs" class="collapse">
     <h3>Pull specs from video file</h3>
     <p class="link"></p>
@@ -1001,7 +1001,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Pull specs -->
 
     <!-- Strip metadata -->
-  <span data-toggle="collapse" data-target="#strip_metadata"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Strip metadata">Strip metadata</button></span>
+  <span data-toggle="collapse" data-target="#strip_metadata"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Strip metadata">Strip metadata</button></span>
   <div id="strip_metadata" class="collapse">
     <h3>Strips metadata from video file</h3>
     <p class="link"></p>
@@ -1022,7 +1022,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="create-thumbnails">Generate image files from a video</h2>
 
   <!-- One thumbnail -->
-  <span data-toggle="collapse" data-target="#one_thumbnail"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Export one thumbnail per video file">One thumbnail</button></span>
+  <span data-toggle="collapse" data-target="#one_thumbnail"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Export one thumbnail per video file">One thumbnail</button></span>
   <div id="one_thumbnail" class="collapse">
     <h3>One thumbnail</h3>
     <p class="link"></p>
@@ -1039,7 +1039,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends One thumbnail -->
 
   <!-- Multi thumbnail -->
-  <span data-toggle="collapse" data-target="#multi_thumbnail"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Export many thumbnails per video file">Many thumbnails</button></span>
+  <span data-toggle="collapse" data-target="#multi_thumbnail"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Export many thumbnails per video file">Many thumbnails</button></span>
   <div id="multi_thumbnail" class="collapse">
     <h3>Many thumbnails</h3>
     <p class="link"></p>
@@ -1060,7 +1060,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="animated-gif">Create an animated GIF</h2>
 
   <!-- Images to GIF -->
-  <span data-toggle="collapse" data-target="#img_to_gif"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Converts images to GIF">Create GIF from still images</button></span>
+  <span data-toggle="collapse" data-target="#img_to_gif"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Converts images to GIF">Create GIF from still images</button></span>
   <div id="img_to_gif" class="collapse">
     <h3>Images to GIF</h3>
     <p class="link"></p>
@@ -1080,7 +1080,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Images to GIF -->
 
   <!-- Create GIF -->
-  <span data-toggle="collapse" data-target="#create_gif"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create a GIF from a video">Create GIF from a video</button></span>
+  <span data-toggle="collapse" data-target="#create_gif"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create a GIF from a video">Create GIF from a video</button></span>
   <div id="create_gif" class="collapse">
     <h3>Create GIF</h3>
     <p class="link"></p>
@@ -1116,7 +1116,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="create-video">Create a video from images</h2>
 
   <!-- Images to video -->
-  <span data-toggle="collapse" data-target="#images_2_video"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Transcode an image sequence into uncompressed 10-bit video">Image sequence into video</button></span>
+  <span data-toggle="collapse" data-target="#images_2_video"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Transcode an image sequence into uncompressed 10-bit video">Image sequence into video</button></span>
   <div id="images_2_video" class="collapse">
     <h3>Transcode an image sequence into uncompressed 10-bit video</h3>
     <p class="link"></p>
@@ -1134,7 +1134,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Images to video -->
 
   <!-- Create video from image and audio  -->
-  <span data-toggle="collapse" data-target="#image-audio"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create video from image and audio">Create video from image and audio</button></span>
+  <span data-toggle="collapse" data-target="#image-audio"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create video from image and audio">Create video from image and audio</button></span>
   <div id="image-audio" class="collapse">
     <h3>Create a video from an image and audio file.</h3>
     <p class="link"></p>
@@ -1159,7 +1159,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="overlay">Overlay timecode or text</h2>
 
   <!-- Text Watermark -->
-  <span data-toggle="collapse" data-target="#text_watermark"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create opaque centered text watermark ">Text Watermark</button></span>
+  <span data-toggle="collapse" data-target="#text_watermark"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create opaque centered text watermark ">Text Watermark</button></span>
   <div id="text_watermark" class="collapse">
     <h3>Create centered, transparent text watermark</h3>
     <p class="link"></p>
@@ -1184,7 +1184,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Text watermark -->
 
   <!-- Transparent Image Watermark -->
-  <span data-toggle="collapse" data-target="#image_watermark"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Overlay image watermark">Overlay image watermark on video</button></span>
+  <span data-toggle="collapse" data-target="#image_watermark"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Overlay image watermark">Overlay image watermark on video</button></span>
   <div id="image_watermark" class="collapse">
     <h3>Overlay image watermark on video</h3>
     <p class="link"></p>
@@ -1200,7 +1200,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends Image Watermark -->
 
   <!-- Burn in timecode-->
-  <span data-toggle="collapse" data-target="#burn_in_timecode"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Burn in timecode ">Burn in timecode</button></span>
+  <span data-toggle="collapse" data-target="#burn_in_timecode"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Burn in timecode ">Burn in timecode</button></span>
   <div id="burn_in_timecode" class="collapse">
     <h3>Create a burnt in timecode on your image</h3>
     <p class="link"></p>
@@ -1230,7 +1230,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="normalise-audio">Normalize/equalize audio</h2>
 
   <!-- phase shift -->
-  <span data-toggle="collapse" data-target="#phase_shift"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Inverses the audio phase of the second channel">Flip phase shift</button></span>
+  <span data-toggle="collapse" data-target="#phase_shift"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Inverses the audio phase of the second channel">Flip phase shift</button></span>
   <div id="phase_shift" class="collapse">
     <h3>Flip audio phase shift</h3>
     <p class="link"></p>
@@ -1248,7 +1248,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends phase shift -->
 
   <!-- loudnorm metadata -->
-  <span data-toggle="collapse" data-target="#loudnorm_metadata"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Calculate Loudness Levels">Calculate Loudness Levels</button></span>
+  <span data-toggle="collapse" data-target="#loudnorm_metadata"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Calculate Loudness Levels">Calculate Loudness Levels</button></span>
   <div id="loudnorm_metadata" class="collapse">
     <h3>Calculate Loudness Levels</h3>
     <p class="link"></p>
@@ -1267,7 +1267,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends loudnorm metadata -->
 
   <!-- RIAA equalization -->
-  <span data-toggle="collapse" data-target="#riaa_eq"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="RIAA Equalization">RIAA Equalization</button></span>
+  <span data-toggle="collapse" data-target="#riaa_eq"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="RIAA Equalization">RIAA Equalization</button></span>
   <div id="riaa_eq" class="collapse">
     <h3>RIAA Equalization</h3>
     <p class="link"></p>
@@ -1283,7 +1283,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends RIAA equalization -->
 
   <!-- one pass loudnorm -->
-  <span data-toggle="collapse" data-target="#loudnorm_one_pass"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="One Pass Loudness Normalization">One Pass Loudness Normalization</button></span>
+  <span data-toggle="collapse" data-target="#loudnorm_one_pass"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="One Pass Loudness Normalization">One Pass Loudness Normalization</button></span>
   <div id="loudnorm_one_pass" class="collapse">
     <h3>One Pass Loudness Normalization</h3>
     <p class="link"></p>
@@ -1302,7 +1302,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends one pass loudnorm -->
 
   <!-- two pass loudnorm -->
-  <span data-toggle="collapse" data-target="#loudnorm_two_pass"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Two Pass Loudness Normalization">Two Pass Loudness Normalization</button></span>
+  <span data-toggle="collapse" data-target="#loudnorm_two_pass"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Two Pass Loudness Normalization">Two Pass Loudness Normalization</button></span>
   <div id="loudnorm_two_pass" class="collapse">
     <h3>Two Pass Loudness Normalization</h3>
     <p class="link"></p>
@@ -1331,7 +1331,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <h2 id="preservation">Preservation tasks</h2>
 
   <!-- batch processing (Mac/Linux) -->
-  <span data-toggle="collapse" data-target="#batch_processing_bash"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="FFmpeg batch processing on Mac/Linux">Batch processing (Mac/Linux)</button></span>
+  <span data-toggle="collapse" data-target="#batch_processing_bash"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="FFmpeg batch processing on Mac/Linux">Batch processing (Mac/Linux)</button></span>
   <div id="batch_processing_bash" class="collapse">
     <h3>Create Bash script to batch process with FFmpeg</h3>
     <p class="link"></p>
@@ -1360,7 +1360,7 @@ e.g.: <code>ffmpeg -f concat -safe 0 -i mylist.txt -c copy <i>output_file</i></c
   <!-- ends batch processing (Mac/Linux) -->
 
   <!-- batch processing (Windows) -->
-  <span data-toggle="collapse" data-target="#batch_processing_win"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="FFmpeg batch processing on Windows">Batch processing (Windows)</button></span>
+  <span data-toggle="collapse" data-target="#batch_processing_win"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="FFmpeg batch processing on Windows">Batch processing (Windows)</button></span>
   <div id="batch_processing_win" class="collapse">
     <h3>Create PowerShell script to batch process with FFmpeg</h3>
     <p class="link"></p>
@@ -1393,7 +1393,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends batch processing (Windows) -->
 
   <!-- Create frame md5s -->
-  <span data-toggle="collapse" data-target="#create_frame_md5s_v"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create an MD5 checksum per video frame">Create MD5 checksums (video frames)</button></span>
+  <span data-toggle="collapse" data-target="#create_frame_md5s_v"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create an MD5 checksum per video frame">Create MD5 checksums (video frames)</button></span>
   <div id="create_frame_md5s_v" class="collapse">
     <h3>Create MD5 checksums (video frames)</h3>
     <p class="link"></p>
@@ -1411,7 +1411,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Create frame md5s -->
 
   <!-- Create frame md5s (audio) -->
-  <span data-toggle="collapse" data-target="#create_frame_md5s_a"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create MD5 checksums for audio samples">Create MD5 checksums (audio samples)</button></span>
+  <span data-toggle="collapse" data-target="#create_frame_md5s_a"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create MD5 checksums for audio samples">Create MD5 checksums (audio samples)</button></span>
   <div id="create_frame_md5s_a" class="collapse">
     <h3>Create MD5 checksums (audio samples)</h3>
     <p class="link"></p>
@@ -1436,7 +1436,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Create frame md5s (audio) -->
 
   <!-- QCTools Report -->
-  <span data-toggle="collapse" data-target="#qctools"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create a QCTools report for a video file with audio track">QCTools report (with audio)</button></span>
+  <span data-toggle="collapse" data-target="#qctools"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create a QCTools report for a video file with audio track">QCTools report (with audio)</button></span>
   <div id="qctools" class="collapse">
     <h3>Creates a QCTools report</h3>
     <p class="link"></p>
@@ -1460,7 +1460,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends QCTools Report -->
 
   <!-- QCTools Report (no audio) -->
-  <span data-toggle="collapse" data-target="#qctools_no_audio"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create a QCTools report for a video file with no audio track">QCTools report (no audio)</button></span>
+  <span data-toggle="collapse" data-target="#qctools_no_audio"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create a QCTools report for a video file with no audio track">QCTools report (no audio)</button></span>
   <div id="qctools_no_audio" class="collapse">
     <h3>Creates a QCTools report</h3>
     <p class="link"></p>
@@ -1484,7 +1484,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends QCTools Report (no audio) -->
 
   <!-- Check FFV1 fixity -->
-  <span data-toggle="collapse" data-target="#check_FFV1_fixity"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Decode your video and verify the internal CRC checksums">Check FFV1 fixity</button></span>
+  <span data-toggle="collapse" data-target="#check_FFV1_fixity"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Decode your video and verify the internal CRC checksums">Check FFV1 fixity</button></span>
   <div id="check_FFV1_fixity" class="collapse">
     <h3>Check FFV1 Version 3 fixity</h3>
     <p class="link"></p>
@@ -1502,7 +1502,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Check FFV1 Fixity  -->
 
   <!-- Read/Extract EIA-608 Closed Captions -->
-  <span data-toggle="collapse" data-target="#readeia608"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Read or extract EIA-608 (Line 21) closed captioning">Read/Extract EIA-608 Closed Captioning</button></span>
+  <span data-toggle="collapse" data-target="#readeia608"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Read or extract EIA-608 (Line 21) closed captioning">Read/Extract EIA-608 Closed Captioning</button></span>
   <div id="readeia608" class="collapse">
     <h3>Read/Extract EIA-608 (Line 21) closed captioning</h3>
     <p class="link"></p>
@@ -1530,7 +1530,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <h2 id="test-files">Generate test files</h2>
 
   <!-- Mandelbrot -->
-  <span data-toggle="collapse" data-target="#mandelbrot"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Make a mandelbrot test pattern video">Mandelbrot</button></span>
+  <span data-toggle="collapse" data-target="#mandelbrot"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Make a mandelbrot test pattern video">Mandelbrot</button></span>
   <div id="mandelbrot" class="collapse">
     <h3>Makes a mandelbrot test pattern video</h3>
     <p class="link"></p>
@@ -1547,7 +1547,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Mandelbrot -->
 
   <!-- SMPTE bars -->
-  <span data-toggle="collapse" data-target="#smpte_bars"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Make a SMPTE bars test pattern video">SMPTE bars</button></span>
+  <span data-toggle="collapse" data-target="#smpte_bars"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Make a SMPTE bars test pattern video">SMPTE bars</button></span>
   <div id="smpte_bars" class="collapse">
     <h3>Makes a SMPTE bars test pattern video</h3>
     <p class="link"></p>
@@ -1564,7 +1564,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends SMPTE bars -->
 
   <!-- Test pattern video -->
-  <span data-toggle="collapse" data-target="#test"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Make a test pattern video">Test pattern</button></span>
+  <span data-toggle="collapse" data-target="#test"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Make a test pattern video">Test pattern</button></span>
   <div id="test" class="collapse">
     <h3>Make a test pattern video</h3>
     <p class="link"></p>
@@ -1582,7 +1582,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Test pattern video -->
 
   <!-- Play HD SMPTE bars -->
-  <span data-toggle="collapse" data-target="#play_hd_smpte"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Test an HD video projector by playing the SMPTE colour bars pattern">Play HD SMPTE bars</button></span>
+  <span data-toggle="collapse" data-target="#play_hd_smpte"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Test an HD video projector by playing the SMPTE colour bars pattern">Play HD SMPTE bars</button></span>
   <div id="play_hd_smpte" class="collapse">
     <h3>Play HD SMPTE bars</h3>
     <p class="link"></p>
@@ -1597,7 +1597,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Play HD SMPTE bars -->
 
   <!-- Play VGA SMPTE bars -->
-  <span data-toggle="collapse" data-target="#play_vga_smpte"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Test a VGA video projector by playing the SMPTE colour bars pattern">Play VGA SMPTE bars</button></span>
+  <span data-toggle="collapse" data-target="#play_vga_smpte"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Test a VGA video projector by playing the SMPTE colour bars pattern">Play VGA SMPTE bars</button></span>
   <div id="play_vga_smpte" class="collapse">
     <h3>Play VGA SMPTE bars</h3>
     <p class="link"></p>
@@ -1612,7 +1612,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Play VGA SMPTE bars -->
 
   <!-- Sine wave -->
-  <span data-toggle="collapse" data-target="#sine_wave"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Generate a test audio file playing a sine wave">Sine wave</button></span>
+  <span data-toggle="collapse" data-target="#sine_wave"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Generate a test audio file playing a sine wave">Sine wave</button></span>
   <div id="sine_wave" class="collapse">
     <h3>Sine wave</h3>
     <p class="link"></p>
@@ -1629,7 +1629,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Sine wave -->
 
   <!-- SMPTE bars + Sine wave -->
-  <span data-toggle="collapse" data-target="#smpte_bars_and_sine_wave"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Generate a SMPTE bars test video + audio playing a sine wave">SMPTE bars + Sine wave audio</button></span>
+  <span data-toggle="collapse" data-target="#smpte_bars_and_sine_wave"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Generate a SMPTE bars test video + audio playing a sine wave">SMPTE bars + Sine wave audio</button></span>
   <div id="smpte_bars_and_sine_wave" class="collapse">
     <h3>SMPTE bars + Sine wave audio</h3>
     <p class="link"></p>
@@ -1650,7 +1650,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends SMPTE bars + Sine wave -->
 
   <!-- Broken File -->
-  <span data-toggle="collapse" data-target="#broken_file"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Make a broken file out of a perfectly good one">Broken file</button></span>
+  <span data-toggle="collapse" data-target="#broken_file"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Make a broken file out of a perfectly good one">Broken file</button></span>
   <div id="broken_file" class="collapse">
     <h3>Makes a broken test file</h3>
     <p class="link"></p>
@@ -1671,7 +1671,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <h2 id="repair">Repair</h2>
 
   <!-- Fix A/V async 1 -->
-  <span data-toggle="collapse" data-target="#avsync_aresample"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Fix A/V sync issues by resampling audio">Fix AV Sync: Resample audio</button></span>
+  <span data-toggle="collapse" data-target="#avsync_aresample"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Fix A/V sync issues by resampling audio">Fix AV Sync: Resample audio</button></span>
   <div id="avsync_aresample" class="collapse">
     <h3>Fix AV Sync: Resample audio</h3>
     <p class="link"></p>
@@ -1692,7 +1692,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <h2 id="ocr">Use OCR</h2>
 
   <!-- Show OCR -->
-  <span data-toggle="collapse" data-target="#ocr_on_top"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Play video with OCR on top">Show OCR</button></span>
+  <span data-toggle="collapse" data-target="#ocr_on_top"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Play video with OCR on top">Show OCR</button></span>
   <div id="ocr_on_top" class="collapse">
     <h3>Plays video with OCR on top</h3>
     <p class="link"></p>
@@ -1715,7 +1715,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Show OCR -->
 
   <!-- Export OCR -->
-  <span data-toggle="collapse" data-target="#ffprobe_ocr"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Export OCR from video to screen">Export OCR</button></span>
+  <span data-toggle="collapse" data-target="#ffprobe_ocr"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Export OCR from video to screen">Export OCR</button></span>
   <div id="ffprobe_ocr" class="collapse">
     <h3>Exports OCR data to screen</h3>
     <p class="link"></p>
@@ -1736,7 +1736,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <h2 id="perceptual-similarity">Compare perceptual similarity of videos</h2>
 
   <!-- Compare Video Fingerprints -->
-  <span data-toggle="collapse" data-target="#compare_video_fingerprints"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Compare Video Fingerprints">Compare Video Fingerprints</button></span>
+  <span data-toggle="collapse" data-target="#compare_video_fingerprints"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Compare Video Fingerprints">Compare Video Fingerprints</button></span>
   <div id="compare_video_fingerprints" class="collapse">
     <h3>Compare two video files for content similarity using perceptual hashing</h3>
     <p class="link"></p>
@@ -1753,7 +1753,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Compare Video Fingerprints -->
 
   <!-- Generate Video Fingerprint -->
-  <span data-toggle="collapse" data-target="#generate_video_fingerprint"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Generate Video Fingerprint">Generate Video Fingerprint</button></span>
+  <span data-toggle="collapse" data-target="#generate_video_fingerprint"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Generate Video Fingerprint">Generate Video Fingerprint</button></span>
   <div id="generate_video_fingerprint" class="collapse">
     <h3>Generate a perceptual hash for an input video file</h3>
     <p class="link"></p>
@@ -1773,7 +1773,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <h2 id="other">Other</h2>
 
   <!-- Play image sequence -->
-  <span data-toggle="collapse" data-target="#play_im_seq"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Play an image sequence directly as moving images">Play an image sequence</button></span>
+  <span data-toggle="collapse" data-target="#play_im_seq"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Play an image sequence directly as moving images">Play an image sequence</button></span>
   <div id="play_im_seq" class="collapse">
     <h3>Play an image sequence</h3>
     <p class="link"></p>
@@ -1794,7 +1794,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Play image sequence -->
 
   <!-- Split audio and video tracks -->
-  <span data-toggle="collapse" data-target="#split_audio_video"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create separate audio and video tracks from an audiovisual file">Split audio and video tracks</button></span>
+  <span data-toggle="collapse" data-target="#split_audio_video"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create separate audio and video tracks from an audiovisual file">Split audio and video tracks</button></span>
   <div id="split_audio_video" class="collapse">
     <h3>Split audio and video tracks</h3>
     <p class="link"></p>
@@ -1812,7 +1812,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Split audio and video tracks -->
 
   <!-- Extract audio from an AV file -->
-  <span data-toggle="collapse" data-target="#extract_audio"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Extract audio without loss from an AV file">Extract audio</button></span>
+  <span data-toggle="collapse" data-target="#extract_audio"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Extract audio without loss from an AV file">Extract audio</button></span>
   <div id="extract_audio" class="collapse">
     <h3>Extract audio from an AV file</h3>
     <p class="link"></p>
@@ -1829,7 +1829,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Extract audio from am AV file -->
 
   <!-- Combine audio tracks  -->
-  <span data-toggle="collapse" data-target="#combine_audio"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Combine audio tracks">Combine audio tracks</button></span>
+  <span data-toggle="collapse" data-target="#combine_audio"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Combine audio tracks">Combine audio tracks</button></span>
   <div id="combine_audio" class="collapse">
     <h3>Combine audio tracks into one in a video file</h3>
     <p class="link"></p>
@@ -1852,7 +1852,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Combine audio tracks  -->
 
   <!-- append notice to access mp3 -->
-  <span data-toggle="collapse" data-target="#append_mp3"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Generate two access MP3s from input. One with added audio (such as a copyright notice) and one unmodified.">Create access MP3</button></span>
+  <span data-toggle="collapse" data-target="#append_mp3"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Generate two access MP3s from input. One with added audio (such as a copyright notice) and one unmodified.">Create access MP3</button></span>
   <div id="append_mp3" class="collapse">
     <h3>Generate two access MP3s from input. One with appended audio (such as a copyright notice) and one unmodified.</h3>
     <p class="link"></p>
@@ -1877,7 +1877,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends append notice to access mp3 -->
 
   <!-- Flip image -->
-  <span data-toggle="collapse" data-target="#flip_image"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Flip the image">Flip video image</button></span>
+  <span data-toggle="collapse" data-target="#flip_image"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Flip the image">Flip video image</button></span>
   <div id="flip_image" class="collapse">
     <h3>Flip the video image horizontally and/or vertically</h3>
     <p class="link"></p>
@@ -1894,7 +1894,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Flip image -->
 
   <!-- Create ISO -->
-  <span data-toggle="collapse" data-target="#create_iso"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Create ISO files for DVD access">Create ISO</button></span>
+  <span data-toggle="collapse" data-target="#create_iso"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Create ISO files for DVD access">Create ISO</button></span>
   <div id="create_iso" class="collapse">
     <h3>Create ISO files for DVD access</h3>
     <p class="link"></p>
@@ -1912,7 +1912,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Create ISO -->
 
   <!-- Scene Detection using YDIF -->
-  <span data-toggle="collapse" data-target="#csv-ydif"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Exports CSV for scene detection using YDIF">CSV with timecodes and YDIF</button></span>
+  <span data-toggle="collapse" data-target="#csv-ydif"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Exports CSV for scene detection using YDIF">CSV with timecodes and YDIF</button></span>
   <div id="csv-ydif" class="collapse">
     <h3>Exports CSV for scene detection using YDIF</h3>
     <p class="link"></p>
@@ -1932,7 +1932,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends sample Scene Detection using YDIF -->
 
   <!-- Cover head switching noise -->
-  <span data-toggle="collapse" data-target="#cover_head"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Cover head switching noise">Cover head switching noise</button></span>
+  <span data-toggle="collapse" data-target="#cover_head"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Cover head switching noise">Cover head switching noise</button></span>
   <div id="cover_head" class="collapse">
     <h3>Cover head switching noise</h3>
     <p class="link"></p>
@@ -1956,7 +1956,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- ends Cover head switching noise -->
 
   <!-- Record and live-stream simultaneously -->
-    <span data-toggle="collapse" data-target="#record-and-stream"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="Record and live-stream simultaneously">Record and live-stream simultaneously</button></span>
+    <span data-toggle="collapse" data-target="#record-and-stream"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="Record and live-stream simultaneously">Record and live-stream simultaneously</button></span>
     <div id="record-and-stream" class="collapse">
       <h3>Record and live-stream simultaneously</h3>
       <p class="link"></p>
@@ -1996,7 +1996,7 @@ ffmpeg -i $file -map 0 -c copy $output
   <!-- END Record and live-stream at the same time -->
 
   <!-- View Subprogram Info -->
-  <span data-toggle="collapse" data-target="#view_subprogram_info"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="View FFmpeg subprogram information">View FFmpeg subprogram information</button></span>
+  <span data-toggle="collapse" data-target="#view_subprogram_info"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="View FFmpeg subprogram information">View FFmpeg subprogram information</button></span>
   <div id="view_subprogram_info" class="collapse">
     <h3>View information about a specific decoder, encoder, demuxer, muxer, or filter</h3>
     <p class="link"></p>
@@ -2022,7 +2022,7 @@ ffmpeg -i $file -map 0 -c copy $output
   </div>
 
   <!-- sample example -->
-  <!-- <span data-toggle="collapse" data-target="#*****unique name*****"><button type="button" class="btn btn-default" data-toggle="tooltip" data-placement="bottom" title="*****Hover-over description*****">*****Small title****</button></span>
+  <!-- <span data-toggle="collapse" data-target="#*****unique name*****"><button type="button" class="btn" data-toggle="tooltip" data-placement="bottom" title="*****Hover-over description*****">*****Small title****</button></span>
   Change the above data-target field, the hover-over description, the button text, and the below div ID
   <div id="*****unique name*****" class="collapse">
     <h3>*****Longer title*****</h3>