title: Cannot click on ::after on Firefox
body: <p>I have a HTML and CSS code, and it works fine on Chrome. However, on Firefox, the behavior is different. </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>button#groupToggle {
      background: 0 0;
      border: 1px solid #e6e6ed;
      color: #222;
      float: none;
      margin: 0 0 0 6px;
      min-width: 200px;
      padding: 8px 10px;
      position: relative;
      text-align: left;
      cursor: pointer;
  }
  
  button#groupToggle::after {
      background: #FFF;
      border: 1px solid #e6e6ed;
      color: #f8971d;
      content: '&gt;';
      display: inline-block;
      font: 900 12px/2.1 'Font Awesome 5 Free';
      height: calc(100% + 1px);
      left: 100%;
      position: absolute;
      text-align: center;
      top: -1px;
      width: 2em;
      cursor: pointer;
      border: ;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;button id="groupToggle"&gt;
    &lt;span&gt;All selected&lt;/span&gt;
  &lt;/button&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>After the All Selected, there is a button that is created through pseudo CSS (after). It can be clicked when hovering on Chrome but not on Firefox. Any thoughts? </p>
  
  <p>Firefox version: 64.0</p>
  
  <p>Link: <a href="https://codepen.io/anon/pen/zymvPj" rel="nofollow noreferrer">https://codepen.io/anon/pen/zymvPj</a> (Please use Firefox to test it).</p>