title: How do I create a div tag heading with a underline?
body: <p>See Wikipedia <a href="http://en.wikipedia.org/wiki/Css" rel="noreferrer">http://en.wikipedia.org/wiki/Css</a></p>
  
  <p>If you look at the heading, it says "Cascading Style Sheets", then it has an underline.</p>
  
  <p><strong>How do you do that?</strong></p>
  
  <pre><code>.heading1 {
  /* heading with underline */
  }
  </code></pre>