I'm a tremendous fan of night or "dark" modes for websites and apps. A darker background uses less battery power and is easier on your eyes than a bright white one. It's a win-win. I've written before about a few Chrome extensions that will let you turn on a dark mode for everything you do. This week I came across a new one that works specifically for Google Docs.
Called Darkdocs, the extension does exactly what you think it does: adds a dark mode to Google Docs.
With it, the background of your Google Doc will be black, and the writing white. The difference can make writing in a dark room more pleasant for both yourself and those around you and can help curb battery drain places like aeroplanes where power might be at a premium.
Since it's a Chrome Extension, it can also be easily toggled off and on using a button on your Chrome toolbar. That way you can switch back and forth if your preferences change in the middle of a writing session.