title: responsive div in between two fixed div elements in IE8
body: <p>Im trying to set an responsive div between two fixed width elements. I have a hard time to make this work on IE8 though, which I have to have it work for. Im having a hard time making this work without the use of <code>calc</code></p>
  
  <p>How do i do this? </p>
  
  <p>Codepen: <a href="https://codepen.io/anon/pen/GmoLgR" rel="nofollow noreferrer">https://codepen.io/anon/pen/GmoLgR</a></p>