Receive up to $504 promo credit ($180 w/Welcome Unlimited, $360 w/ 5G Start, or $504 w/5G Do More, 5G Play More, 5G Get More or One Unlimited for iPhone plan (Welcome Unlimited and One Unlimited for iPhone plans can't be mixed w/other Unlimited plans; all lines on the account req'd on respective plans)) when you add a new smartphone line with your own 4G/5G smartphone on an eligible postpaid plan between 2/10/23 and 3/31/23. Promo credit applied over 36 months; promo credits end if eligibility requirements are no longer met.
In the Nook and Kindle android apps, you can control the background through the settings. The Kindle does it throught the fonts button and the Nook button is in the settings. The black background sure goes a long way in keeping a sleeping spouse happy.
Accessibility Options might o it for you.
Black Background and Light Text is good for the Vision Impaired.
Naa Doesn't seem to have a way to flip the colors. Would be nice