To change the background color of the panes in UR, see
http://www.kinook.com/Forum/showthre...?threadid=2267. For web page items in the detail pane, this only defines a default background color, and if the page explicitly defines the background color, it will override the default. For text items, another way to set the background is described here:
http://www.kinook.com/Forum/showthread.php?t=2133.