load block/tx pages at correct blockchain scroll position

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

@@ -49,7 +49,7 @@
       </ng-container>
     </ng-template>
   </div>
-<div [hidden]="!arrowVisible" id="arrow-up" [style.transition]="transition" [ngStyle]="{'left': arrowLeftPx + 'px' }"></div>
+<div [hidden]="!arrowVisible" id="arrow-up" [style.transition]="arrowTransition" [ngStyle]="{'left': arrowLeftPx + 'px' }"></div>
 </div>
 
 <ng-template #loadingBlocksTemplate>