>
      <button class="btn btn-positive">
        <span class="icon icon-search"></span>
        Button
      </button>
      <button class="btn btn-negative">
        <span class="icon icon-search"></span>
        Button
      </button>
      <button class="btn btn-link">
        <span class="icon icon-left"></span>
        Button
      </button>
    </div>

{% highlight html %}
<button class="btn">
  <span class="icon icon-search"></span>
  Button
</button>
<button class="btn btn-primary">
  <span class="