Invert colors in viwer

[LordWolfenstein]

Describe the solution you'd like
A button that inverts colors in documents in the viewer. I.e. I want dark background and light text to make it easier on the eyes when reading e-books. There are plenty of web browser plugins that do exactly this for the web but I want it when I am reading E-books.

Describe alternatives you've considered
When I work on my own documents I can just set it so that is no problem so It is E-books that caused the problem. In Acrobat Reader you can just set the colors you want but that is cumbersome and you don't always get all text to change. A simple button to invert colors would fix everything.