Fix communities spaces beta card layout

res/css/structures/_MyGroups.scss

@@ -20,6 +20,7 @@ limitations under the License.
 
     .mx_BetaCard {
         margin: 0 40px;
+        max-width: 960px;
     }
 }
 
@@ -34,7 +35,7 @@ limitations under the License.
     flex-wrap: wrap;
 }
 
-.mx_MyGroups > :not(.mx_RoomHeader) {
+.mx_MyGroups > :not(.mx_RoomHeader):not(.mx_BetaCard) {
     max-width: 960px;
     margin: 40px;
 }