body {
    height: 100%;
    text-align: center;
    background-color: black;
}

a {
    color: cornflowerblue;
}

.contenitore {
    position: relative;
    margin-top: 6em;
}

.codice {
    font-weight: bold;
    font-size: 6em;
    color: #f3f3f3;
    z-index: 1;
}

.nota {
    font-style: italic;
    font-size: 1.5em;
    color: #444;
    z-index: 2;
}

.aiuto {
    margin-top: 2.5em;
    font-style: italic;
    font-size: 2em;
    color: #f3f3f3;
    z-index: 1;
}