Scrollbar styling?

Is it possible to style the appearance of the scrollbar with WBB? I'm using one of the shoutboxes and would like to change the background color of the scrollbar, how can I do that?

Quote from SoftCreatR

https://github.com/gromo/jquery.scrollbar

I've tried changing the background-color for all of these but nothing seems to work:

.scrollbar-inner > .scroll-element .scroll-element_track { background-color: #e0e0e0; }
.scrollbar-inner > .scroll-element .scroll-bar { background-color: #c2c2c2; }
.scrollbar-inner > .scroll-element:hover .scroll-bar { background-color: #919191; }
.scrollbar-inner > .scroll-element.scroll-draggable .scroll-bar { background-color: #919191; }

Am I even close to the correct class?