Huh, interesting. I just searched with Chrome’s development tools and couldn’t find it either.
It is settable from Admin, Customize, Colors, Highlight. No CSS required…
I’ve changed the HIGHLIGHT colors and Save ( then enable that Color theme ) but the YELLOW color is still there
Did you do a CTRL F5 to force a reload of the CSS?
Hover color is finally changed however the COLOR is always brighter than the specified color.
Example: I choose BLACK as highlight color —> when test the Black color become brighter —> GREY.
Do you have any why it behave this way?