Update index.html

Author: isbendiyarovanezrin

29 - Countdown Timer/index.html

@@ -48,6 +48,12 @@
       </div>
     </div>
 
+    <audio loop preload="auto" id="sound">
+      <source src="sound/tick-tock.mp3" />
+      Your browser does not support the
+      <code>audio</code> element.
+    </audio>
+
     <!-- javascript -->
     <script src="js/script.js"></script>
   </body>