body {
    margin: 4%;
    background-color: #111;
}

div#main {
    padding: 4%;
    border-radius: 20px;
    background-color: rgba(150, 150, 150, 0.5);
}

#final {
    padding: 1%;
    font-size: 2em;
    text-align: center;
    background-color: #ddd;
}

#paramsForm {
    padding: 2%;
}