title: How to avoid name collisions of css class names
body: <p>I am writting a web page using css classes of PURE by Yahoo.
  In detail, it is really not an independent web page but a part of a web page of some site. And I have no contact to the company running the site.</p>
  
  <p>When I tested my part as an independent web page, it looked fine. Though when I tested the part within the parent web page, I noticed that the css did not work at all. </p>
  
  <p>The only reason I can assume for the errors is name collisions. For example, my part uses class "header" defined in PURE. I guess the class name is used by programmers of the parent web page.</p>
  
  <p>If my assumption is correct, could you help me to avoid name collisions of css class names.</p>