background-color warning

Hi, i recieved the following warning from the validator, which i am unsure
of:

Warnings

URI : http://cservice.gdchat.org/cservice.css
Line : 10 Level : 1 You have no color with your background-color : BODY

Valid CSS informations

BODY {
position : absolute;
top : 0;
left : 0;
right : 0;
bottom : 0;
margin : 0;
padding : 0;
height : 100%;
background-color : #003366;
}

I specified a color, so why does it say i have no color?

Regards, Chris.