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         <div id="box1" onclick="popup_box('audio1','b1')"><i class="b1 fa fa-play"></i></div> <p>Folklore literature</p>
         <div id="box2" onclick="popup_box('audio2','b2')"><i class="b2 fa fa-play" aria-hidden="true"></i></div><p>Islamic Mysticism</p>
         <div id="box3" onclick="popup_box('audio3','b3')"><i class="b3 fa fa-play" aria-hidden="true"></i></div> <p>Contemporary poets</p>
-        <div id="box4"><i class="box4 fa fa-play" aria-hidden="true"></i></div> <p>Contemporary musicians</p>
+        <div id="box4"><i class="box4 fa fa-stop" aria-hidden="true"></i></div> <p>Contemporary musicians</p>
       </div>
       </div>
       </div>