Border-Right

I seem to be getting an error with this stylesheet when I try to validate: http://www.rickbull.co.uk/tutorials/default.css
it tells me that there is an error with the line border-right:3px solid #666; (in the @media projection section), and that it contains an empty string. Is this a validator error, or have I made a mistake?

must be a validation error because there's no problem there from what I can see. I've tried all sorts on it to try to get it to validate but it's not having any of it.

I did find a way round it by using border and cascading...

http://jigsaw.w3.org/css-validator/v...1&profile=css2

Thank you, good idea. Don't know why I didn't think of it (Mr thick, black thickey, adder thickey ;)) :o