title: Ionic 4 round icon only button outside of toolbar/ion-buttons
body: <p>How do I create a circular, clear, icon-only button outside of ion-buttons? I want to have a button with the style you get, when you use and icon-only button inside <code>ion-buttons</code> (e.g. clear and circular). 
  My code so far:</p>
  
  <pre><code>    &lt;ion-button icon-only shape="round" color="white" fill="clear"&gt;
          &lt;ion-icon slot="icon-only" name="close"&gt;&lt;/ion-icon&gt;
      &lt;/ion-button&gt;
  </code></pre>
  
  <p>The resulting button isn't circular though, it's just a rectangular button with rounded corners.</p>
  
  <p>The ionic 4 documentation doesn't mention how to do it.</p>