:root {
    font-family: sans-serif;
}
span {
    color: green;
}
h3 {
    font-weight: inherit;
}
blockquote {
    margin-left: 0;
    max-width: 40em;
}
center {
    position: relative;
    top: 20vh;
    transform: translateY(-20%);
}
@media(prefers-color-scheme: dark) {
    :root {
        background: #1c1b20;
        color: #eee;
    }
    a {
        color: dodgerblue;
    }
}