body {
    font-family: Arial, sans-serif;
}

label {
    display: block;
    margin-bottom: 10px;
}

input[type="number"] {
    width: 220px;
    padding: 5px;
    margin-left: 10px;
}

fieldset {
    margin: 12px 0;
    padding: 8px;
}

fieldset label {
    display: block;
    margin-bottom: 6px;
}

button {
    margin-top: 12px;
    padding: 6px 12px;
    cursor: pointer;
}

#above30 {
    margin-top: 10px;
    font-weight: bold;
}

.green {
    background-color: greenyellow;
}