title: Flexbox fill available space vertically
body: <p>Now in a <code>flexbox</code> row I can write</p>
  
  <pre><code>&lt;div layout="row"&gt;
    &lt;div&gt;some content&lt;/div&gt;
    &lt;div flex&gt;&lt;/div&gt; &lt;!-- fills/grows available space --&gt;
    &lt;div&gt;another content&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I would like to achieve the same but vertically, like on this picture
  <a href="https://i.stack.imgur.com/wdOmI.png" rel="noreferrer"><img src="https://i.stack.imgur.com/wdOmI.png" alt="enter image description here"></a>
  Currently the problem is that the <em>div</em> which would need to grow doesn't have any <em>height</em> so the two contents are below each other. <em>I want my second content to be at the bottom of the parent container which has a fixed height!</em> </p>
  
  <p>I know I could solve this by positioning the second content absolute and <code>bottom: 0;</code> but can I achieve this with <code>flexbox</code>?</p>