title: CSS transition fade on hover
body: <p>I've encountered a problem with <code>CSS</code> transitions. I'm designing a <code>CSS</code> gallery for my portfolio and I need my images to fade in on hover. 
  I've been playing around with this for over an hour and I was hoping someone could point me into the right direction.</p>
  
  <p>Here is a simplified version to it with <a href="http://jsfiddle.net/kwh71787/HwPkN/" rel="noreferrer">JSFiddle</a></p>