Ensure hangup button selector is specific enough to apply red color and custom size

css/font.css

     content: "\e617";
 }
 
-.icon-hangup {
-    color:#ff0000;
-    font-size: 1.4em;
-}
-
 .icon-reload:before {
     content: "\e618";
 }

css/main.css

                     0 -1px 10px #00ccff;
 }
 
+#toolbar_button_hangup {
+    color: #ff0000;
+    font-size: 1.4em;
+}
+
 #numberOfParticipants {
     position: absolute;
     top: 0px;