title: Less refer classes from different CSS files
body: <p>I'm creating a HTML/CSS page which is using Bootstrap. In fact I have to customize some parts. Because of several reasons some class names do not match the original from Bootstrap.
  So, I have two files. bootstrap.min.css and main.less (=>main.min.css).
  I'm wondering if it is possible to match classes in main.less to bootstrap.min.css.
  So, I have a class .orderby (in main) which should have the same settings then .form-control (bootstrap).
  Something like this:</p>
  
  <pre><code>.orderby { @.form-control }
  </code></pre>
  
  <p>But I have no clue how to refer to another css file.</p>
  
  <p>Would appreciate if somebody can point me to the right feature.
  Thank you!</p>