https://www.tech-recipes.com/blog/2010/07/23/iphone-4-trick-invert-colors-for-white-text-on-black-background/
iPhone 4 Trick: Invert Colors for White Text on Black Background - Tech Recipes
Jul 23, 2010 - iPhones and similar digital devices are frequently difficult to see in certain situations. The 4th generation of the iPhone now comes with a shortcut to...
invert colorson blackiphonetrickwhite
https://feedback.xodo.com/support/solutions/articles/35000251388-invert-colors-mode
Invert Colors Mode : Xodo
invert colorsmodexodo