I want to change the CSS background definition for #wpadminbar in the new WordPress 3.8 admin themes. I can (and have) updated the /wp-admin/css/colors/theme/colors.min.css file but wonder if there is a cleaner way? Is there a filter that I could use in functions.php to update this specific style?
I found this approach but it is a blunt instrument, replacing the entire CSS file:
If it matters, I find the single color for the top bar and left column visually odd so I've manually updated #wpadminbar to use the medium color shade assigned to the background of #adminmenu.wp-submenu style. That makes the top bar slightly darker than the left column.
Thanks for any ideas how I might do this more cleanly.