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On the "Themes" tab of the book settings - over to the left of the "NIGHT" selection are some color swatches...one for the letter colors, one for the background. You can select exactly which color you wish for any of the themes. I would expect that you don't have true black selected for the background on the night theme...or for the text on the normal theme.
Also, FYI, if you click the contrast button settings there is a label at the bottom "Tap to enable extra dimming" that puts an overlay across the screen reducing the opacity. This causes extra dimming aside from sliding the brightness up and down...
Cheers!
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