Gerry: On my "Peter Masterpieces" TEST page, I've created one sample "content slide" for your review and feedback [please].
https://www.warrencampdesign.com/peter/peter-masterpieces.pg1.TEST-MBX.php
Most of the first nine thumbs are vertical/portrait formations; when triggered, the first eight enlarged images have MBX description containers beneath them that get cut off, which is expected. The ninth thumb (the painting by Fra Carnevale) opens my sample "content slide."
Viewing that enlarged "content slide" on my full-screen iMac, it fills the height of the screen and has a maximum width of 1280 pixels. I'm pleased with its rendering and look.
My concern with this full-size rendering is the need to provide a margin-bottom value to the "content slide" div. Without that margin, the description box at the bottom gets compromised; the lower portion of the second line of text, which has a hyperlink, gets cut off.
To which existing rule do I add a margin-bottom attribute to match the margin-top value of the top caption?
In addition, to which rule do I change the white background of the top caption and the bottom description container?
Many thanks, in advance, Gerry!