message: Delete open animation
diff: <button class="mat-mini-fab" mat-fab color="accent" (click)="createNewWhitelistUser()"
  matTooltip="Add course">
  - <mat-icon class="md-24 open-animation" [class.icon-open]="open">add</mat-icon>
  + <mat-icon>add</mat-icon>
  </button>
  