.va-calc-container {
    max-width: 600px;
    margin: 30px auto;
    font-family: Arial, sans-serif;
    padding: 20px;
    background: #f8f9fa;
    border: 1px solid #ccc;
    border-radius: 12px;
}
.va-calc-container input[type="number"] {
    width: 70px;
    margin: 5px 0;
}
.va-calc-container button {
    margin-right: 10px;
    margin-top: 10px;
}
.va-calc-container .result {
    margin-top: 20px;
    font-weight: bold;
}