vB4 How do I change the color of menu arrows?

[محروم.كوم]

I've done a template search, Stylevar search, and even searched the clientscript folder for relevant clues on where to style the arrows on drop-downs. They are white by default, and I want them to be black. How do I do that? Oh, and I've searched these forums but can't find anything. __DEFINE_LIKE_SHARE__