Second this - I'd have put the requirements of "expert" to be "advanced", skipped the rather small part of "know how to animation" as it doesn't constitute such a "level" for itself as much as beeing "one of the tools you'd probably know if you think you can write a frontend from scratch in css".

The "expert" category would rather be "having a deep understanding of what the browser does with styles and how the concepts of display etc actually work" for me.

But it's really hard to draw a line, css allows for awful hacky solutions that end up looking like they work, and many people "able to write a full frontend project" will produce rather bad CSS irl.