@juliamon Actually nevermind, you don't even have to rely on me to do it, someone else already has: https://userstyles.world/style/26372
The extension you need is called Stylus. Just install it, open the user style above, hit the "Install" button, and it should take you to a screen in the extension with an "Install style" button on the left side.
Obvs the caveat about Google breaking it whenever they want still applies, though...