diff --git a/12/index.html b/12/index.html
index 5d885ff..86c4402 100644
--- a/12/index.html
+++ b/12/index.html
@@ -107,12 +107,12 @@
       <div id="authors"></div>
     </div>
     <div class="audio_05">
-      <audio controls>
+      <audio controls="">
         <source src="archive_12.5.mp3" type="audio/mp3">
-        <track default kind="captions"
-               srclang="en"
-               src="archive_12.5.vtt">
-      </audio>
+        <track default="" kind="captions" srclang="en" src="archive_12.5.vtt">
+      </audio> 
+    </div>
+      
       <div class="icon" id="clock_icon"><img src="IMG/clock.png" width="100" height="100"></div>
       <div class="icon" id="TOC_icon"><img src="IMG/program.png" width="100" height="100"></div>
       <div class="icon" id="resources_icon"><img src="IMG/broadcast.png" width="100" height="100"></div>