Help with GTK themes: Contextual menus

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http://www.linuxquestions.org – I was hoping to find some help with styling contextual menus within a GTK theme. I am specifically trying to change the color of the hover event of a menu item. I've defined menu_gradient_a and menu_gradient_b in menu.css, which works fine in some applications, though many others (Firefox, GIMP, etc.) seem to ignore this declaration. I have pawed and scratched through all of the other CSS files associated with the theme, but can't seem to figure this out. (Edit: Also, .menubar.menuitem:hover, .menubar .menuitem:hover {} in menu.css was my go-to as well, but fussing with that set of selectors (HowTos)