White on black is generally hard on the eyes than the normal black on white. However, if you have certain vision problems, the black background is beneficial. I have visual problems and had to end my membership at several sites because they took a fancy to a black background format that I simply could not read above 5 minutes. The slight greyed background here on Mobile reads is pretty easy to read. I can even read the small text, which is pretty amazing. Good type choice, IMHO.
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