title: Flexbox different size childs
body: <p>I learn flexbox and I have a first question how to make such a layout of columns as in the picture?  <code>[</code>MyCodeFiddle<code>](</code><a href="http://jsfiddle.net/1s3bo913/" rel="nofollow noreferrer">http://jsfiddle.net/1s3bo913/</a><code>)</code></p>
  
  <p><a href="https://i.stack.imgur.com/AjAdx.jpg" rel="nofollow noreferrer">layout project</a></p>