I have wanted to do this for a while now, trivial but crucial.
You know dark modes? You know if you are reading an e-book, there is a toggle to turn off the whites and replace it with blacks so your eyes are strained?
Well, Dark Mode on Yellow Optic works the same way.
Click the button that says Dark Mode on the right of your screen to invert the color palette of the white background and the black text into black backgrounds with white text.
That should make it easier for you at night.