title: Fixed menu on left and content scrollable
body: <p>I would like to have a menu which is fixed on left and the content is scrollable on the right.</p>
  
  <p>What I want to do is exactly like this website: <a href="http://other.wpengine.com/" rel="noreferrer">http://other.wpengine.com/</a></p>
  
  <p>The menu fixed and content scrollable.</p>
  
  <p>Could you guys help me out?</p>
  
  <p>Thanks in advance!</p>