Change Colors Of Scrollbar On Smf Forum

I have a SMF Forum installed on my website. I use the "default' style. On several of its pages, it has scrollbars. This is not the scrollbar of my windows, this is integrated within the SMF program. I have modified the color scheme to my purpose, but scrollbar and up and down arrows are not graphic files. If they are, I haven't been able to find them. Question is: How, and where do I change the color of the scrollbars and the up an down arrows. Currently they are light blue. I want to make them burgundy. I'm very surprise to find, as of this date, no one knows the answer. I would appreciate any help.

Regards

Please consider this problem resolved!