ngClass class strings in apostrophe

src/app/components/network/network-menu/network-menu.component.html

@@ -9,7 +9,7 @@
   <button
     (click)="networkHandler.activeNetwork.toggleNetworkSidebar()"
     class="button is-small is-primary network-toolbar-toggle"
-    [ngClass]="{ rotated: networkHandler.activeNetwork.networkSidebarOpen }"
+    [ngClass]="{ 'rotated': networkHandler.activeNetwork.networkSidebarOpen }"
   >
     <i class="fas fa-angle-left"></i>
   </button>