title: Angular Material - change color of clicked mat-list-option
body: <p>Is there a possibility to change the default color of a checked checkbox (mat-pseudo-checkbox-checked): </p>
  
  <pre><code>&lt;mat-selection-list #shoes&gt;
    &lt;mat-list-option *ngFor="let shoe of typesOfShoes"&gt;
      {{shoe}}
    &lt;/mat-list-option&gt;
  &lt;/mat-selection-list&gt;
  </code></pre>
  
  <p>I have tried:</p>
  
  <pre><code>.mat-pseudo-checkbox-checked {
      background-color: #00f;
  }
  </code></pre>
  
  <p>but it has no impact.</p>