<button type="button" class="btn btn-theme">Theme</button>
<button type="button" class="btn btn-default">Default</button>
<button type="button" class="btn btn-secondary">Secondary</button>
<button type="button" class="btn btn-light">Light</button>
<button type="button" class="btn btn-dark">Dark</button>
<button type="button" class="btn btn-info">Info</button>
<button type="button" class="btn btn-primary">Primary</button>
<button type="button" class="btn btn-purple">Purple</button>
<button type="button" class="btn btn-indigo">Indigo</button>
<button type="button" class="btn btn-link">Link</button>
<button type="button" class="btn btn-danger">Danger</button>
<button type="button" class="btn btn-pink">Pink</button>
<button type="button" class="btn btn-warning">Warning</button>
<button type="button" class="btn btn-yellow">Yellow</button>
<button type="button" class="btn btn-lime">Lime</button>
<button type="button" class="btn btn-teal">Teal</button>
<button type="button" class="btn btn-success">Success</button>
<button type="button" class="btn btn-white">White</button>
<button type="button" class="btn btn-black">Black</button>