title: Safari CSS column exhibits overflow bug
body: <p>Please check this snippet in Chrome vs Safari:
  <a href="https://codepen.io/peminator/pen/JjdmQmy" rel="nofollow noreferrer">https://codepen.io/peminator/pen/JjdmQmy</a>)</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>.col {
    column-count: 5;
    font-size: 20px;
  }
  
  .col div {
    background: #ddd;
    position: relative;
  }
  
  .col div::before {
    content: '@';
    position: absolute;
    left: -12px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="col"&gt;
    &lt;div&gt;A&lt;/div&gt;
    &lt;div&gt;A&lt;/div&gt;
    &lt;div&gt;A&lt;/div&gt;
    &lt;div&gt;A&lt;/div&gt;
    &lt;div&gt;A&lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Why in Safari that @ is not visible? Is there some way to fix? </p>