title: Bootstrap banner image resizing
body: <p>How can I do this on bootstrap so that the banner on a mobile device becomes in the pictures?</p>
  <p>Desktop:
  <a href="https://i.stack.imgur.com/jFsfj.jpg" rel="nofollow noreferrer">desktop</a></p>
  <p>768:
  <a href="https://i.stack.imgur.com/fGXNF.jpg" rel="nofollow noreferrer">768</a></p>
  <p>mobile:
  <a href="https://i.stack.imgur.com/GjhHf.jpg" rel="nofollow noreferrer">360</a></p>