title: CSS grid with auto-flow: columns - how to flex grow only the last column?
body: <p>If I have a grid which auto-flows columns</p>
  
  <pre><code>    display: grid;
      grid-auto-flow: column;
  </code></pre>
  
  <p>So I <em>don't</em> know the number of columns I have</p>
  
  <p>how would I say "I want all columns to be the minimum size for the contents and the last column to fill all available space"?</p>
  
  <p>I'm aware that in the simple case this is achievable with flexbox, I'm trying to bolster my grid knowledge specifically.</p>