I was recently tasked with rewriting the base CSS for an inventory/project management system, creating a set of reusable components designed to match, using an open/close approach. These were based on a pretty strict specification provided by one of our designers, who unfortunately left.

The implementation went well, but I've run into a bit of a problem. Quite often the team members make changes directly to the base class in the new base CSS file, rather than extending it, creating a new one, or using each system area's dedicated stylesheet file.

One of the more recent changes involved removing a grid-gap property from a rule from the base CSS, affecting a lot more than the single UI element the team member was working on.

Should I approach the team about this?

I haven't mentioned anything yet, but have noticed our QA team putting in more bugs about UI elements looking odd