Pixel 2 dark theme/9to5Google
Here's how to do it if you want a user interface that's a little easier on the eyes.
Everything You Need to Know About the Pixel 2's Dark Theme
There's no settings menu toggle for switching between light and dark themes on the Pixel 2. Instead, all you need to do is change your wallpaper to a darker image. To do that, just long-press on the home screen until a menu pops up. Then select "Wallpaper" and choose from a list of default options and your own saved images.
Once you make the change, the dark theme will switch on automatically to match your new wallpaper. It adds a dark background with white text for the app drawer, the pull-down notification tab, the quick settings menu, the volume indicators and the power menu, according to 9to5Google.
Comparing light mode and dark mode on the Pixel 2/Phone Arena
Why the Dark Theme Actually Matters on the Pixel 2
Your visual preferences aside, using a dark theme on the Pixel 2 also comes with a big perk: it can save you battery life. That's because Google's new phones use OLED displays, which show black images by turning off the relevant pixels. The blacker your screen is, the less energy you're using to power it.
As an added bonus, OLED also offers deeper blacks than LCD. So this dark theme should look even better than it would on a phone with an LCD display.