title: Change size of mat-icon-button
body: <p>How can I change mat-icon-button size? My icon has 24px now and I would like to increase that value to 48px. I use mat-icon as a button content. I also noticed that mat-icon-button has just hardcoded 40px/40px size.</p>
  
  <pre><code>&lt;button mat-icon-button color="primary"&gt;
      &lt;mat-icon class="material-icons"&gt;play_circle_filled&lt;/mat-icon&gt;
  &lt;/button&gt;
  </code></pre>