tree background color question

Ok, I got a really dumb question ... how do I set the background color of the tree object so it matches my page? Also, is "transparent" an option for the background?

Is there a CSS reference for the tree object?

Thanks

tree.setStyle("background", "none");

or

tree.setStyle("background", "transparent");

Thanks Alex. Figures it was that easy.

Curious ... now that it is implemented, I'm noticing a thin white box around the tree object. Is there a way to get rid of this? Would it be the same as for the grid CSS?