Add mempool special block animation.

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

@@ -1,8 +1,8 @@
 <ng-container *ngIf="(loadingBlocks$ | async) === false; else loadingBlocks">
   <div class="mempool-blocks-container" *ngIf="(timeAvg$ | async) as timeAvg;">
-    <div class="flashing">      
+    <div class="flashing">
       <ng-template ngFor let-projectedBlock [ngForOf]="mempoolBlocks$ | async" let-i="index" [ngForTrackBy]="trackByFn">
-        <div class="bitcoin-block text-center mempool-block" id="mempool-block-{{ i }}" [ngStyle]="mempoolBlockStyles[i]">
+        <div class="bitcoin-block text-center mempool-block" id="mempool-block-{{ i }}" [ngStyle]="mempoolBlockStyles[i]"  [class.blink-bg]="projectedBlock.blink">
           <a [routerLink]="['/mempool-block/' | relativeUrl, i]" class="blockLink">&nbsp;</a>
           <div class="block-body">
             <div class="fees">