title: Can we include common css class in another css class?
body: <p>I am a CSS newbie. I am just wondering, is that possible to include one common class into another class?</p>
  
  <p>for example,</p>
  
  <pre><code>.center {align: center};
  .content { include .center here};
  </code></pre>
  
  <p>I came across css framework - <a href="http://blueprintcss.org" rel="noreferrer">Blueprint</a>. We need to put the position information into HTML, e.g.</p>
  
  <pre><code>&lt;div class="span-4"&gt;&lt;div class="span-24 last"&gt;
  </code></pre>
  
  <p>As such, we will place the positioning attribute inside html, instead of css. If we change the layout, we need to change html, instead of css.</p>
  
  <p>That's the reason I ask this question. If I can include .span-4 into my own css, i won't have to specify it in my html tag.</p>