title: ng-bootstrap Modal size
body: <p>What is the best way to set/override a custom width for a modal? </p>
  
  <p>It seems ng-bootstrap currently supports </p>
  
  <blockquote>
    <p>size: 'sm' | 'lg'</p>
  </blockquote>
  
  <p>but Bootstrap 4 supports sm, md and lg.</p>
  
  <p>Ideally I would like the modal to be responsive and adjust similar to container sizes. And on mobile have it go full screen.</p>
  
  <p><strong>EDIT:</strong> Bootstrap 4 _variables.scss seems to have a $modal-md setting but appears to be unused.</p>
  
  <pre><code>$modal-lg:                    800px !default;
  $modal-md:                    500px !default;
  $modal-sm:                    300px !default;
  </code></pre>