Remove font size for btn and use bootstrap class.

src/styles/components/_chat.scss

@@ -461,11 +461,10 @@
         width: 55px;
       }
       .btn-primary {
-        padding: 2px 4px;
+        padding: 2px 5px;
       }
       .fa {
         color: #fff;
-        font-size: 20px;
         line-height: 24px;
       }
     }

static/partials/picturehover.html

@@ -1,11 +1,11 @@
 <div class="buddyInfoActions">
     <div class="btn-group">
-        <a class="btn btn-primary" ng-click="doCall()" title="Start video call">
+        <button class="btn btn-lg btn-primary" ng-click="doCall()" title="Start video call">
             <i class="fa fa-phone"></i>
-        </a>
-        <a class="btn btn-primary" ng-click="startChat()" title="Start chat">
+        </button>
+        <button class="btn btn-lg btn-primary" ng-click="startChat()" title="Start chat">
             <i class="fa fa-comments-o"></i>
-        </a>
+        </button>
     </div>
 </div>