Many users prefer dark color schemes on their computers. I'm one of them. CSS media queries can be used to change the look of a site using the user's preference. I made an update a while back to my website and blog so that the home page and blog will respond to a user's color theme preference. The CSS media query for this is very simple:

@media(prefers-color-scheme: dark) {
    .background {
        background: midnightblue;
    }
    .ground {
        background: #004100;
    }
    .cloud {
        opacity: .5;
    }
    .title-back {
        background: palegoldenrod;
    }
}

The Home Page on Light Theme

The Home Page on Dark Theme