Replace Claro CSS variables used in Field UI

I'd suggest not to only remove claro css variables from field_ui module, but.. keep module's styles simple.
Maybe makes sense to move a lot of css styles from module to claro

Should we replace them with hardcoded values or create local variables with different names?

Could the issue summary be updated to include agreed upon solution? #4 and #5 seems to be discussing that.

Updated the issue summary.

Changes look good to me.

committed this as is, I agree #4 is a valid task, but I'll let that up to a follow-up

Committed f1bbcd1 and pushed to 11.x. Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.