Fixes the size of the hangup button.

index.html

                     <div class="header_button_separator"></div>
                     <span id="hangup">
                         <a class="button" data-toggle="popover" data-placement="bottom" data-content="Hang Up" onclick='hangup();'>
-                            <i class="icon-hangup" style="color:#f42a24;"></i>
+                            <i class="icon-hangup" style="color:#ff0000;font-size: 1.4em;"></i>
                         </a>
                     </span>
                 </span>