Yes, the stylesheet.css is definitely being used, I can change the formatting of the text to anything else, just not getting it to do the page-break-before (or after). I read about it, including the page-break-inside
here and just tried them all to see if there would be any changes.
I've tried it on a Sony 350 and Kobo Glo, both seem to ignore the page-break, leaving the section number at the bottom of one page and the text starting on another.