body{
    font-family: sans-serif;
    margin: 40px auto;
    padding: 0px 10px;
    max-width: 650px;
    line-height: 1.5;
    background-color: whitesmoke;
}

textarea {
    height: 400px;
    width: 100%;
}

form > *:not(label, [type=submit], [type=checkbox]) {
    width: 100%;
    display: block;
    box-sizing: border-box;
    margin-bottom: 1em;
}

pre {
    background-color: gainsboro;
    padding: 1em;
}

nav > * {
    margin-right: 10px;
}

main > nav {
    margin-top: 1em;
}

footer {
    padding-top: 1em;
    margin-top: 1em;
    border-top: 1px solid;
}

.link::before {
    content: "↗ ";
}

.hidden {
    display: none !important;
}