Hi Hilda,
Great question! i’m afraid the calendar’s layout is sent tot the printer as-is rather than with a customized CSS file. I do see that we have an open feature request for this and I do know that we’ve discussed it internally on the team before, but haven’t landed on the best way to approach it. If you could add your vote and perhaps thoughts on how that might work, it would be greatly appreciated! I’ve also made a note for us to discuss this again on the team, because I see more votes have been added and yet the request hasn’t moved in a few months.
Sorry for the bad news, but does this help answer your question? Please let me know.
Thanks,
Geoff