JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<div class="btn-group">
  <button data-toggle="dropdown" class="btn btn-default dropdown-toggle" style="width: 400px;text-align: left;">        
    <span class="glyphicon glyphicon-chevron-down"></span>
    Checked option
  </button>
</div>

CSS

div.btn-group span {
  position: absolute;
  top: 7px;
  right: 12px;
}