title: How to use CSS in Markdown?
body: <p>I want to use a CSS class in a Markdown file.</p>
  
  <p>For instance, <code>&lt;i class="icon-renren"&gt;&lt;/i&gt;</code> (from <code>fontawesome</code>) should be displayed as an icon if I import its CSS file in HTML.</p>
  
  <p>Is there any solution in Markdown?</p>