Including the colour outside the primary content area wouldn't be very accurate, since this is dependent on the viewer's screen resolution. For example, viewing Facebook on a widescreen display yields significantly more white than on a non-widescreen display.
I'm keeping white/black and greytones out for now. White/light greys are especially hard... how would you differentiate between the content and the background?
Is it ignore background-colors? Firefox is primarily green on this but of course the large button is there but the overall theme of the site seems to be that shade of blue
Must go deeper haha.