#custom-calc-form {
    max-width: 500px;
    margin: 20px auto;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: #f9f9f9;
}

#custom-calc-form .step {
    margin-bottom: 20px;
}

#custom-calc-form button {
    background: #0073aa;
    color: #fff;
    border: none;
    padding: 8px 15px;
    cursor: pointer;
    border-radius: 5px;
}

#calc-result {
    margin-top: 15px;
    font-weight: bold;
}