title: angular material date picker close event
body: <p>I am using Angular material date picker as below. when date picker is closed, I need to apply the CSS. FYI, I don't have any button to close the popup</p>
  
  <p>Code:</p>
  
  <pre><code> &lt;input
            matInput
            #resultPickerModel="ngModel"
            [matDatepicker]="pickerEndDate"
            [(ngModel)]="endDate"
            (click)="pickerEndDate.open()"
            name="endDate"
            [min]="minStartDate"
            [max]="maxEndDateDate"
          /&gt;
          &lt;mat-datepicker #pickerEndDate&gt;&lt;/mat-datepicker&gt;
  </code></pre>
  
  <p>My expectation is that I need to apply the CSS when calendar is closed. Kindly help me to do that</p>