title: How can I remove the select box from angular mat-menu?
body: <p>I am using angular 6.1.3, and angular/material 6.4.5 (all in latest version)
  But when I run the following code, it always has a blue select box.</p>
  
  <p>I tried this on both chrome and IE, and both has the same problem.</p>
  
  <p>Is there any way to remove the blue box?</p>
  
  <p>Thanks!</p>
  
  <pre><code>&lt;mat-menu #usermenu [overlapTrigger]="false"&gt;
          &lt;button mat-menu-item&gt;
                  &lt;mat-icon&gt;face&lt;/mat-icon&gt;
                  &lt;label&gt;Profile&lt;/label&gt;
              &lt;/button&gt;
  
              &lt;button mat-menu-item&gt;
                  &lt;mat-icon&gt;exit_to_app&lt;/mat-icon&gt;
                  &lt;label&gt;Logout&lt;/label&gt;
              &lt;/button&gt;
  &lt;/mat-menu&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/nzA1S.png" rel="noreferrer"><img src="https://i.stack.imgur.com/nzA1S.png" alt="enter image description here"></a></p>