web/frontend/src/app/views/virtual-scroll/scroller.html

<div class="mobileDatePicker">
  <div class="month">
    {{currentMonth | uppercase }}
    <span class="material-icons monthIcon">calendar_today</span>
  </div>
  <div class="cdk-virtual-scroll-data-source-example">
    <cdk-virtual-scroll-viewport orientation="horizontal" itemSize="60" minBufferPx="400" maxBufferPx="1000"  class="example-viewport" (scrolledIndexChange)="changeMonth($event)">
      <div *cdkVirtualFor="let item of items" class="example-item">
        <div class="item" (click)="select(item)" [ngClass]="{'is-active':item===selectedItem}">
          <span class="weekName">{{returnWeekDay(item)}}</span>
          <span class="weekName"> {{item | date:'d'}}</span>
        </div>
      </div>
    </cdk-virtual-scroll-viewport>
  </div>
<div>