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Bootstrap class: .blockquote-reverse

<blockquote class="blockquote blockquote-reverse">
  <p class="mb-0">Lorem ipsum dolor sit amet, consectetur adipiscing elit.  </p>
  <footer class="blockquote-footer">Someone famous in
    <cite title="Source Title">Source Title</cite>
  </footer>
</blockquote>

Preview

Lorem ipsum dolor sit amet, consectetur adipiscing elit.