How do you implement dark mode using CSS?

Use the prefers-color-scheme media query or toggle themes via classes.

Example (automatic via system theme):

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@media (prefers-color-scheme: dark) {

body {

background: #121212;

color: #fff;

}
}

Example (manual toggle):

body.dark-mode {

background: #000;

color: white;

}

Key Takeaway:

Dark mode can adapt automatically or via user preference toggles.