Far from ideal, but if you really want to give it a try you can use the accessibility features on your OS. If you're using a Mac you can go to preferences, acce

Far from ideal, but if you really want to give it a try you can use the accessibility features on your OS. If you're using a Mac you can go to preferences, accessibility, display, and tick invert colors. Grayscale is also good. I recently used this feature in a flight for the opposite situation. I was trying to learn go in the go playground but their editor only offers a light theme. After a couple of hours my eyes got tired and I was able to continue thanks to this accessibility feature.