Styiling olivetti's margins?

[bradmont]

Hey, I've been building a minor mode that emulates a paginated word processor type view on top of olivetti mode, you can see it here. I've tried everything I can think of to get my page break overlays to extend into the margins olivetti is producing. Can you give me any hints on how I might go about getting some text in there that I can assign a background to?

Love the package by the way. :)