title: multiple columns inside a grid element
body: <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>.grid {
    display: grid;
    grid-template-columns: 1fr 99px;
    background: silver;
    height: 100vh;
  }
  
  .gridleft {
    column-count: 4;
    background: lightblue;
    overflow-y: scroll;
  }
  
  .title {
    background: lightblue;
    height: 450px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class='grid'&gt;
    &lt;div class='gridleft'&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
      &lt;div class='title'&gt;lorem&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class='gridright'&gt;
  
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Why there is more than 4 columns inside <code>gridleft</code>?  </p>
  
  <p>I need the classic multiple columns content, with columns of equal width and vertical flow direction, but inside a grid element.</p>
  
  <p>Any help?</p>