A generic close button for dismissing content like modals and alerts.
<button type="button" class="btn-close" aria-label="Close"></button>
<button type="button" class="btn-close" disabled aria-label="Close"></button>
<button type="button" class="btn-close btn-close-white" aria-label="Close"></button>
<button type="button" class="btn-close btn-close-white" disabled aria-label="Close"></button>