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;
}

textarea {
    box-sizing: border-box;
    width: 100%;
}

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

img {
    max-width: 100%;
}

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

    a:link {
        color: #5bf;
    }

    a:visited {
        color: #ccf;
    }
}