On a second thought I think it would be easier to do without any CSS, doing all the work on the pdf-engine.
I was confused by the "archive" / plain text version some sites offer to print directly from the browser.. After seeing the examples on this topic, I think OSClass needs a different approach, and it's better to do something like the examples. Ready to print, but also to "share" IRL, with de-attachable parts.
A nice feature would be if a QR code is included