clock selected block arrow

frontend/src/app/components/mempool-blocks/mempool-blocks.component.html

@@ -2,6 +2,11 @@
   <div class="mempool-blocks-container" [class.time-ltr]="timeLtr" [style.--block-size]="blockWidth+'px'" *ngIf="(difficultyAdjustments$ | async) as da;">
     <div class="flashing">
       <ng-template ngFor let-projectedBlock [ngForOf]="mempoolBlocks$ | async" let-i="index" [ngForTrackBy]="trackByFn">
+        <div
+          *ngIf="minimal && spotlight > 0 && spotlight === i + 1"
+          class="spotlight-bottom"
+          [style.right]="mempoolBlockStyles[i].right"
+        ></div>
         <div @blockEntryTrigger [@.disabled]="i > 0 || !animateEntry" [attr.data-cy]="'mempool-block-' + i" class="bitcoin-block text-center mempool-block" [class.hide-block]="count && i >= count" id="mempool-block-{{ i }}" [ngStyle]="mempoolBlockStyles[i]" [class.blink-bg]="projectedBlock.blink">
           <a draggable="false" [routerLink]="['/mempool-block/' | relativeUrl, i]"
             class="blockLink" [ngClass]="{'disabled': (this.stateService.blockScrolling$ | async)}">&nbsp;</a>

frontend/src/app/components/mempool-blocks/mempool-blocks.component.scss

@@ -157,4 +157,16 @@
   #arrow-up {
     transform: translateX(70px);
   }
+}
+
+.spotlight-bottom {
+  position: absolute;
+  width: calc(0.6 * var(--block-size));
+  height: calc(0.25 * var(--block-size));
+  border-left: solid calc(0.3 * var(--block-size)) transparent;
+  border-bottom: solid calc(0.3 * var(--block-size)) white;
+  border-right: solid calc(0.3 * var(--block-size)) transparent;
+  transform: translate(calc(-0.2 * var(--block-size)), calc(1.1 * var(--block-size)));
+  border-radius: 2px;
+  z-index: -1;
 }

frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts

@@ -27,6 +27,7 @@ export class MempoolBlocksComponent implements OnInit, OnChanges, OnDestroy {
   @Input() minimal: boolean = false;
   @Input() blockWidth: number = 125;
   @Input() count: number = null;
+  @Input() spotlight: number = 0;
 
   specialBlocks = specialBlocks;
   mempoolBlocks: MempoolBlock[] = [];