@momentum-ui/react-collaboration/scss/components/button-group/examples/dark.html

Cisco Momentum UI Framework for React Collaboration Applications

  <div class="md-button-group md-button-group--dark md-button-group--justified" role="group">
    <button
      class="md-button md-button--36"
      alt="Spaces"
      type="button"
      aria-label="Spaces">
      <span class="md-button__children">Spaces</span>
    </button>
    <button
      class="md-button md-button--36"
      alt="Messages"
      type="button"
      aria-label="Messages">
      <span class="md-button__children">Messages</span>
    </button>
  </div>