mempool/frontend/src/app/components/clock/clock-a.component.html

<app-clock-face>
  <div class="block-wrapper">
    <ng-container *ngIf="block && block.height >= 0">
      <div class="block-cube">
        <div class="side top"></div>
        <div class="side bottom"></div>
        <div class="side right" [style]="blockStyle"></div>
        <div class="side left" [style]="blockStyle"></div>
        <div class="side front" [style]="blockStyle"></div>
        <div class="side back" [style]="blockStyle"></div>
      </div>
      <div class="title-wrapper">
        <h1 class="block-height">{{ block.height }}</h1>
      </div>
    </ng-container>
  </div>
</app-clock-face>