body {
    font-family: sans-serif;
}

.marco {
    max-width: 600px;
    padding: 32px;
    margin: 32px auto;
    box-shadow: 1px 1px 5px rgba(0,0,0,0.3);
}

#resultado {
    margin-top: 20px;
    margin-bottom: 100px;
}