Can I tweak the CSS behind jQueryUI?

Can I tweak the CSS behind jQueryUI?


I just implemented the jQuery tabs. It came with a color scheme I do
not like. And I don't want to use any of the theme rollers. We have
very specific needs in that we only want our images to show up as the
tabs which they do, but the CSS inherited from this plugin is grey and
has rounded borders, etc. We don't want borders or background colors
behind any of the jQuery tabs functionality.
I am not sure if it's possible to modify the CSS that's behind this?
Or if so how or where could I do this? One would assume jquery-
ui-1.7.1.custom.css but just checking to make sure this is the right
place to do so for jQuery tabs for example.