mempool/frontend/src/app/components/blockchain/blockchain.component.html

<div class="text-center" class="blockchain-wrapper">
  <div class="position-container">
    <app-mempool-blocks [markIndex]="markMempoolBlockIndex" [txFeePerVSize]="markHeight ? 0 : txFeePerVSize"></app-mempool-blocks>
    <app-blockchain-blocks [markHeight]="markHeight"></app-blockchain-blocks>

    <div id="divider" *ngIf="!isLoading; else loadingTmpl"></div>

    <ng-template #loadingTmpl>
      <div class="loading-block">
        <h3>Waiting for blocks...</h3>
        <br>
        <div class="spinner-border text-light"></div>
      </div>
    </ng-template>

  </div>
</div>