body {
    max-width: 650px;
    margin: 40px auto;
    padding: 0 10px;
    font: 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
}

h1, h2, h3 {
    line-height: 1.2
}

@media (prefers-color-scheme: dark) {
    body {
        color: white;
        background: #444
    }

    a:link {
        color: #5bf
    }

    a:visited {
        color: #ccf
    }
}