title: Equal height columns - CSS
body: <p>I have an outer div-element which contains many inner div-elements. I would like to achieve that the inner-divs have the same height on every window-size. </p>
  
  <p>If i use <code>display: flex;</code> on the outer-div, the problem is that all inner-divs come on one line. There should be five divs in a row and when the window is getting smaller, they should flow down.</p>
  
  <p>Here is a JSFiddle: <a href="https://jsfiddle.net/k7oLbqj1/5/" rel="nofollow noreferrer">https://jsfiddle.net/k7oLbqj1/5/</a></p>
  
  <p>I can solve this issue with only CSS. I hope somebody can help me.</p>
  
  <p>Thanks in advance!</p>