title: Title with bottom border smaller than width
body: <p>I need to create an <strong>underline effect</strong> with a bottom border that is smaller than the <code>h2</code> title's width. Usually I don't upload images but I figure it might help explaining the question a bit further:</p>
  
  <p><img src="https://i.stack.imgur.com/t8BQC.png" alt="Title with a bottom border smaller than is&#39;t width"> </p>