My related product images are being chopped off. How can I increase the height of the image container?

Related Products images too short?  Here's how to increase their height.

If you need to adjust it, please go to Admin > Themes > Template Editor.  Open up customise.scss.  Down the bottom, add this:
.thumbnail-small .vertical-center {
  height: 250px;
}

You can adjust '250px' up and down as required.  Making 250 higher will make the photos higher, and reducing it will make the photos less tall.

Done!