Button styles can be applied to anything with the .btn class applied. However, typically you'll want to apply these to only <a> and <button> elements for the best rendering.
<!-- Basic Buttons -->
<div class="docs-example">
<!-- Basic Buttons -->
<button class="btn btn-default">Default</button>
<button class="btn btn-primary">Primary</button>
<button class="btn btn-info">Info</button>
<button class="btn btn-success">Success</button>
<button class="btn btn-warning">Warning</button>
<button class="btn btn-danger">Danger</button>
<button class="btn btn-link">Link</button>
</div>