title: Rails Diffy Gem: How to Use CSS
body: <p>I'm using diffy (<a href="https://github.com/samg/diffy" rel="noreferrer">click for github</a>).  It's awesome, but I can't figure out how to add colors using the css is comes with.  The readme mentions it's possible to do this, but I'm not really sure how to leverage their css.</p>
  
  <p>I'm pretty sure it's possible, since <a href="http://drasticcode.com/2010/11/26/the-easiest-way-to-diff-two-strings-in-ruby" rel="noreferrer">this guy talks about it</a>. </p>
  
  <p>Has anyone worked with diffy for colors before?</p>