Answer:
Dark theme applies to the Android system UI and supported apps. Colors don't change in media, such as videos.
Color inversion applies to everything on your device, including media. For example, black text on a white screen becomes white text on a black screen. There can be issues with color quality or legibility.
Turn on dark theme
Open your device's Settings app .
Tap Accessibility.
Under Display, turn on Dark theme.
Turn on color inversion
Open your device's Settings app .
Tap Accessibility.
Under Display, tap Color inversion.
Turn on Use color inversion.
Optional: Turn on Color inversion shortcut. Learn about accessibility shortcuts.
Using dark theme and color inversion together
Android 10 or later: If you open an app that doesn't support a dark theme, turn on color inversion in addition to dark theme.
Android 9 or earlier: You can use only one of these settings at a time. For example, if you turn on dark theme, color inversion automatically turns off.
