body {
    margin: 40px auto;
    max-width: 650px;
    line-height: 1.6;
    font-size: 18px;
    color: #444;
    padding: 0 10px;
    font-family: sans-serif;
}

@media (prefers-color-scheme: dark) {
    body {
        color: #eee;
    }
}

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