title: Bootstrap Calendar Glyphicons not showing properly
body: <p>I have Bootstrap form which has calendar icon into form-group as like in following image.
  <a href="https://i.stack.imgur.com/tzX9e.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tzX9e.png" alt="enter image description here"></a></p>
  
  <p>I have problem when only add calendar icon into it all other icon works fine.</p>
  
  <pre><code>&lt;i class="glyphicon glyphicon-calendar"&gt;&lt;/i&gt;
  </code></pre>