title: CSS Grid scrolling issue: right-side padding and border "overlapping" content
body: <p>I don't understand this behavior. Is it a bug? What do I have to do so that the right padding and border stay outside of the (orange) content?</p>
  
  <p>UPDATE: I want the scrolling. The problem is that the right padding and border are not pushed to the right, but overlap the (orange) content.</p>
  
  <p><a href="https://i.stack.imgur.com/ymYQP.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ymYQP.gif" alt="enter image description here"></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-html lang-html prettyprint-override"><code>&lt;!doctype html&gt;
  &lt;html&gt;
  &lt;title&gt;Test&lt;/title&gt;
  &lt;head&gt;
  &lt;meta http-equiv='content-type' content='text/html; charset=UTF-8'&gt;
  &lt;style&gt;
  *, *:before, *:after { padding: 0px; border: 0px; margin: 0px; box-sizing: border-box; }
  #grid &gt; div { border: 20px solid orange; }
  &lt;/style&gt;
  &lt;/head&gt;
  &lt;body style='width: 90vw; height: 90vh;'&gt;
    &lt;div id='scrollpane' style='width: 100%; height: 100%; overflow: auto; border: 20px solid yellow;'&gt;
      &lt;div id='grid' style='width: 100%; display: grid; grid-template-columns: 1fr auto 200px 1fr; border: 20px solid lightsteelblue; padding: 20px;'&gt;
        &lt;div&gt;1fr&lt;/div&gt;&lt;div&gt;auto&lt;/div&gt;&lt;div&gt;200px&lt;/div&gt;&lt;div&gt;1fr&lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>