[Enhancement] Add a night mode

[DhruvaSambrani]

It would be best if you could implement something like what Sumatra has, with Text Color and Background Color and a linear gradient to match.
Else, at least a simple invert

[DhruvaSambrani]

With a function to call from a keystroke also 😄

[DhruvaSambrani]

Some workarounds in this thread may help

[Aerijo]

I'll probably end up adding this when I get styling sorted. The current "style" is just make the none-page background invisible.

[shivaprsd]

Hi, if you are using pre-built viewer from PDF.js, you might want to have a look at https://github.com/shivaprsd/doq (disclaimer: I am the author).