@media (prefers-color-scheme: light) {
    body {
        background-color: white;
        color: black;
    }

    a {
        color: red;
    }
}
@media (prefers-color-scheme: dark) {
    body {
        background-color: black;
        color: white;
    }

    a {
        color: yellow;
    }
}