Some other color property with the same class was overriding your color. You can easily identify using 'inspect'.
Using !important is never a recommendation unless you HAVE TO.
By default the mybb.css works fine, other ACP theme should take care of that part while being developed.
Using !important is never a recommendation unless you HAVE TO.
By default the mybb.css works fine, other ACP theme should take care of that part while being developed.