#gcb-form {
    max-width: 420px;
    margin: auto;
    padding: 30px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
    text-align: center;
}

#gcb-form h2 {
    color: #0d1b2a;
}

#gcb-form input,
#gcb-form select {
    width: 100%;
    padding: 14px;
    margin: 10px 0;
    border-radius: 6px;
    border: 1px solid #ccc;
}

#gcb-form button {
    width: 100%;
    padding: 15px;
    background: #25D366;
    color: #fff;
    border: none;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
}

#gcb-msg {
    margin-top: 10px;
    color: green;
}