<button class="notification-button" mat-mini-fab [matMenuTriggerFor]="bell">
  <mat-icon matBadge="3" matBadgeColor="warn" class="notification-button__icon">notifications_none</mat-icon>
</button>
<mat-menu #bell="matMenu" xPosition="before" class="notification-menu">
  <button mat-menu-item class="notification-menu__button">
    <mat-icon class="notification-menu__icon_yellow">local_offer</mat-icon>
    Kie 2.0.0 has release!
  </button>
  <button mat-menu-item class="notification-menu__button">
    <mat-icon class="notification-menu__icon_green">thumb_up</mat-icon>
    New Control Panel is Coming!
  </button>
  <button mat-menu-item class="notification-menu__button">
    <mat-icon class="notification-menu__icon_pink">notifications_none</mat-icon>
    There is a critical Bug in javachassis.
  </button>

</mat-menu>