PLT-6614 - Mentions badge styling and dropdown icon style (#6426)

* Mentions badge styling and dropdown icon style

* PLT-6134 - Fixing emoji picker border in RHS

webapp/components/notify_counts.jsx

@@ -37,9 +37,9 @@ export default class NotifyCounts extends React.Component {
     }
     render() {
         if (this.state.mentionCount) {
-            return <span className='badge badge-notify'>{this.state.mentionCount}</span>;
+            return <span className='mention-badge badge-notify'>{this.state.mentionCount}</span>;
         } else if (this.state.messageCount) {
-            return <span className='badge badge-notify'>{'•'}</span>;
+            return <span className='mention-badge badge-notify'>{'•'}</span>;
         }
         return null;
     }