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