SO - 14948984

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
<div class="btn-group">
  <button class="btn special">Action</button>
  <button class="btn dropdown-toggle" data-toggle="dropdown">
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu">
    <!-- dropdown menu links -->
  </ul>
</div>

CSS

.btn.special {
    background-color: #F5F5F5;
    color: #333333;
    background-image: linear-gradient(to bottom, #FFFFFF, #E6E6E6);
    text-decoration: none;
    background-position: 0;
    transition: none;
}