Fixed some colors and layout issues
What does this MR do and why?
After updating to 15.7.3 I noticed some color issues on system broadcast message banner and a small layout issue on the admin topics page, which this MR solves
I fixed both on the same MR since the changes were quite trivial
Screenshots or screen recordings
| Where | Before | After |
|---|---|---|
| Brodcast message banner |  |
 |
| Admin topics page |  |
 |
How to set up and validate locally
It's enough to check the broadcast message and topics admin pages
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.