Yes, after working with this a little more, getting the comments also would be great (header is fine as is).

And for matgb's suggestion about max-width, two questions:
Do I want a space after the colon?
Would I replace both lines that say "margin" with one, and leave the
!important;
at the end of it?

(Hm, maybe for comments just replace the word "entry" with "comments"?)

I've never done any coding, so your copy/paste is really appreciated.

I'll be AFK until Monday or Tuesday.

A million thanks!