Bootstrap class: .toast

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<!-- Note a custom script is used to activate toasts:
$('.toast').toast();
-->

<div class="toast fade show" role="alert" aria-live="assertive" aria-atomic="true">
  <div class="toast-header">
    <strong class="mr-auto">Bootstrap</strong>
    <small>11 mins ago</small>
    <button type="button" class="ml-2 mb-1 close" data-dismiss="toast" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>
  <div class="toast-body">
    Hello, world! This is a toast message.
  </div>
</div>

Preview