title: how can i apply custom class next to cdk-overlay-pane for material menu in angular 7
body: <p>i have requirement where i want to create mega menu using angular material menu. now i want apply some style to cdk-overlay-pane using own custom class
  for that i used class and panelClass attribute but doesn't work for me.</p>
  
  <p>i tried to apply custom class on  using class and panelClass attribute. please check below code</p>
  
  <pre><code>&lt;mat-menu #menu="matMenu" [overlapTrigger]="false" panelClass='CustomClass'&gt;
  </code></pre>
  
  <p></p>
  
  <pre><code>&lt;mat-menu #menu="matMenu" [overlapTrigger]="false" class='CustomClass'&gt;
  </code></pre>
  
  <p></p>
  
  <p>none of above code is working for me.</p>
  
  <p>it should be apply custom class next to cdk panel class when angular material open menu cdk overlay</p>