Add space between join button and accordion arrow

src/app/participant-room/participant-room.component.scss

@@ -6,6 +6,7 @@ mat-card {
 mat-card-content>:first-child {
   margin-top: 16px;
 }
+
 mat-icon {
   font-size: 500%;
 }

src/app/room-list/room-list.component.scss

+button {
+  margin-right: 10px;
+}