Button active colors

<!-- Source -->
<div class="btn-group">
  <button class="btn btn-secondary btn-active-primary active" type="button">Active</button>
  <button class="btn btn-secondary" type="button">Secondary</button>
</div>

<!-- All colors -->
<button class="btn btn-secondary active btn-active-primary" type="button">Primary</button>
<button class="btn btn-secondary active btn-active-secondary" type="button">Secondary</button>
<button class="btn btn-secondary active btn-active-success" type="button">Success</button>
<button class="btn btn-secondary active btn-active-info" type="button">Info</button>
<button class="btn btn-secondary active btn-active-warning" type="button">Warning</button>
<button class="btn btn-secondary active btn-active-danger" type="button">Danger</button>
<button class="btn btn-secondary active btn-active-light" type="button">Light</button>
<button class="btn btn-secondary active btn-active-dark" type="button">Dark</button>
<button class="btn btn-secondary active btn-active-black" type="button">Black</button>
<button class="btn btn-secondary active btn-active-indigo" type="button">Indigo</button>
<button class="btn btn-secondary active btn-active-orange" type="button">Orange</button>
<button class="btn btn-secondary active btn-active-pink" type="button">Pink</button>
<button class="btn btn-secondary active btn-active-purple" type="button">Purple</button>
<button class="btn btn-secondary active btn-active-teal" type="button">Teal</button>
<button class="btn btn-secondary active btn-active-white" type="button">White</button>