:root {
    font-family: sans-serif;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0.3em;
    border: thin solid;
    text-align: center;

    & li {
        display: inline;
        margin: 0;
        padding: 1em;
    }
}

/* Our numbers are short… */
input[type="number"] { width: 5em; }
/* … but URIs are long. In particular, a CSS width avoids the jumping of widths when toggling font for hex. */
//input[type="text"], input:not([type]) { width: 20em; }