It seems like if I ever hit the big "FORUMS" button the color goes back to white and my rods and cones start to burn away. The only way to keep it dark is to only navigate through the sidebar buttons and my "following septagon" button.
EDIT: It seems to have stopped now. I think it was only cause the school library computer was being stupid lol
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Sometimes its in white, sometimes they gray, it seems random for me to be honest.