Resolve "Various improvements"

Closes #196 (closed)

src/app/components/shared/content-groups/content-groups.component.scss

@@ -9,14 +9,14 @@
   text-align: center;
   transition: all 0.25s;
   margin-top: 10px;
-  max-height: 80px;
-  padding: 5px; 
+  max-height: 50px;
+  padding: 5px;
 
   &:hover {
     cursor: pointer;
     background-color: mat-color($arsnova-primary, 200);
     top: -15px;
-    box-shadow: 0 12px 16px rgba(0, 0, 0, 0.2);
+    box-shadow: 10px 20px 20px rgba(0, 0, 0, 0.2);
   }
 }