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";
    color: #444;
}
h1,
h2,
h3 {
    line-height: 1.2;
}

.title {
    text-align: center;
    width: 100%;
}

@media (prefers-color-scheme: dark) {
    body {
        color: #c9d1d9;
        background: #0d1117;
    }
    a:link {
        color: #58a6ff;
    }
    a:visited {
        color: #8e96f0;
    }
}