title: Extract only used css classes from css file
body: <p>I'm working on an upgrade for our current application (asp.net mvc). Here my problem is, I have a existing css file name "styles.css". Now this file has lots of css classes and they are used in different pages.</p>
  
  <p>Now as a part of the upgrade process, this css file will not be used anymore. But I still want certain css classes from this file, so that I can copy them to a new file and include it in my pages.</p>
  
  <p>Any ideas on how to extract these styles which are used in my new pages. And yes the styles which I want to pick are already set to the controls in the page. Please help.</p>