System notes darkmode fixes
What does this MR do and why?
This is a follow-up to Rewrite system note CSS (!162639 - merged) to fix colors in darkmode.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
| Before | After |
|---|---|
 |
 |
 |
 |
How to set up and validate locally
- Go to an MR
Related to #469616 (closed), !162639 (merged)