Topic: changing colour of buttons

Hello all,

Newbie here, first post of many no doubt. I only have a limited knowledge of this kind of stuff so simpleton terms would be appreciated.

I'm making a photo site and have used simple viewer for a couple of galleries but I want the background colour to be white which I have achieved but the 'next' and 'previous' buttons are also white and so don't show up. I've had to change backgrounds back to grey for now until I discover how to change colour of buttons.

Would anyone be able to shed a bit of light onto how to I might be able to do this?

Thanks very for your time.