It is just one programs opinion :) but I too would be concerned that the SE's would come to the same (incorrect) opinion.
What does the program say if you make the default text color white by adding it to the body:
Code:
body {
background-color: #000000;
color: #FFFFFF;
}
...then of course any place you actually wanted the text black you would need to change it in the individual class.
William.