thanks for taking interest in the project and opensource. i would say proper "PR etiquette" to follow is to open an issue and ask the maintainer(s) if they are accepting PRs in the first place and also what you are wanting to contribute. this benefits are twofold, you dont needlessly spend time on something that wont be accepted and the maintainer(s) dont feel bad for turning down something that someone put effort into.
thanks for catching the typo and i hope you enjoy the card. without having to repeat myself, im going to direct you to this comment on a previous PR: https://github.com/kinghat/tabbed-card/pull/20#issuecomment-1281160610