title: css: how to combine multiple stylesheets into one
body: <p>Does anyone know on how to combine multiple stylesheets into one? For example I have</p>
  
  <pre><code>&lt;link rel="stylesheet" type="text/css" href="abc.css" /&gt;
  &lt;link rel="stylesheet" type="text/css" href="efg.css" /&gt;
  &lt;link rel="stylesheet" type="text/css" href="hij.css" /&gt;
  </code></pre>
  
  <p>in mysite.html. How can I combine the above 3 stylesheets into one?</p>
  
  <p>thank you.</p>