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What if you had a window you could move around and could be resized that would invert the colors of whatever is underneath?
Example: Let's say you are reading a pdf closer to nighttime and you would prefer black background/white text
System: Windows 10 touchscreen laptop
Requirement: under 40$
A long time ago I downloaded MagicAction For Youtube (extension plug-in, just for chrome I think), you can do a lot of things like buffer for video (to help to load it), and also some crazy thing like revert the video screen, then you can also invert color:
