How to change color of borders in default style

[giza]

Hi all,
can someone instruct me where can i change the border color in the default vb style, i modified most of the colors from Main CSS but i cannot find the blue borders around categories and navbar, i want that color to be red, is this an image that i need to edit or just color code for borders???

here is the link if you dont mind taking a look of what i'm talking about
http://archiedu.com/home/forum/index.php?

thanks in advance

[Princeton]

edit "tborder"

[giza]

thanks a trilion man