Flexbox: How to have a flex child not fill entire height

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I had a horizontal list of items, and if a line of text got to 2 lines, I had some additional space and its flex siblings were extending to the full height.

Before

This was the code:

<li class="flex">
  <code class="flex-none text-sm whitespace-normal mr-2 mt-0.5 bg-white text-black p-1 ">
    {new Date(post.date).toString().slice(4, 11)}
  </code>{' '}
  <code class="flex-none text-sm whitespace-normal mr-2 bg-black text-white border p-1 ">
    {post.tag}
  </code>
  <a href={'/' + post.url + '/'}>{post.title}</a>
</li>

To fix this, I added the self-start class to the code blocks which in Tailwind CSS applies align-self: start;

After

Lessons in this unit:

0:	Introduction
1:	Align rows or columns
2:	Vertical and horizontal alignment
3:	Wrap
4:	Moving items before / after another one using order
5:	Vertical alignment using align-self
6:	Grow or shrink an item if necessary
7:	Create a layout using Flexbox
8:	▶︎ How to have a flex child not fill entire height