I need help changing some colors. Using Invision style

I have these white borders I want to change into black.
How do I do That?

Please help

first one is for the drop down menu. for the profile as in looking at profile sending a message etc.

nevermind already solved messed about with the css and now its all good:)
All I still want to do is change the color of the combo boxes if someone could help with that. that would be awesome.

cheers

what are combo boxes?

I mean the box in the bottom. Like the boxes where you have to click and get a list. I send in a picture Also want to change the profile field colors.

just so it wont be forgotten"