title: Create a circular button in BS3
body: <p>I want to create a rounded button in BS3 (a perfect circle), with a single fontawesome(4.0) icon in the center.</p>
  
  <p>So far, I have the following code:</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;a href="#" class="btn btn-default"&gt;&lt;i class="fa fa-user"&gt;&lt;/i&gt;&lt;/a&gt;
  </code></pre>
  
  <p>What would the CSS markup be to make this button a perfect circle?</p>