css prefers-color-scheme example
This uses the @media and prefers-color-scheme to check which one you have as a setting in your browser
CSS
body { background: white; color: black; }
@media (prefers-color-scheme: light) {
body { background: white; color: #666; }
}
@media (prefers-color-scheme: dark) {
body { background: black; color: #666; }
}