title: Bootstrap modal, scrollable does not work
body: <p>I have a boostrap 4.5 modal with some content, by default if the content is too big for the window, a scrollbar should appear.</p>
  <p>I have also try to add 'modal-dialog-scrollable' but I don't see any scrollbar and some parts of the dialog are not accessible !</p>
  <p>If someone has an idea of the problem ?</p>
  <p>Here is a small extract of the generated code:
  <a href="https://codepen.io/cdemez/pen/BajrJzW" rel="nofollow noreferrer">https://codepen.io/cdemez/pen/BajrJzW</a></p>
  <pre><code>..
  </code></pre>
  <p><a href="https://i.stack.imgur.com/vgopw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vgopw.png" alt="enter image description here" /></a></p>