diff --git a/index.html b/index.html
index 09b4196..ea41c82 100644
--- a/index.html
+++ b/index.html
@@ -504,8 +504,8 @@ path_name_and_extension_to_the_last_file</i></pre></dd>
 <!-- ends NTSC to H.264 -->
 
 <!-- 4:3 to 16:9 -->
-<span data-toggle="modal" data-target=".4-3_16-9"><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>
-<div class="modal fade 4-3_16-9" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">
+<span data-toggle="modal" 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>
+<div class="modal fade SD_HD" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">
   <div class="modal-dialog modal-lg">
     <div class="modal-content">
       <div class="well">