>Zell Liew has published a lot of things like margins. This post is about Susy, but he has discussed it in broader terms elsewhere in his posts, IIRC. https://zellwk.com/blog/susy-gutter-positions/

I do not think this is from regular CSS support. However, after having read some of that, and searched on Google, I believe the div column-gap support would be exactly what I am looking for. So, I would need to remove the margin-right and use that instead.