title: How to pass parameters to css classes
body: <p>I want to know is it possible to add some flexibility to css via this:</p>
  
  <pre><code>&lt;div class='round5'&gt;&lt;/div&gt;
  </code></pre>
  
  <p>where <code>.round</code> is a class with round corners and '5' determines the amount of radius. Is it possible? I have seen some where, but I don't know how the implementation takes place.</p>