Description of problem:
Gnome-panel clock seems to be rendered in dark grey text
on black background when it is not focused.
This makes it a bit hard to see. ;) :)
(In fact I thought it was black on black but staring
at it I see it is actually dark grey, but almost invisible.)

Version-Release number of selected component (if applicable):
gnome-panel-2.91.x

How reproducible:
every time

Steps to Reproduce:
1. login to fallback gnome
2. look at clock
3. move mouse to clock
  
Actual results:
2. can't see time (without staring at clock)
3. grey on white highlighting

Expected results:
2. white or light grey on black

Additional info:
This has been happening for weeks now.
So I thought time to report it...