* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #f4f4f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.payment-container {
    background-color: #fff;
    width: 400px;
    padding: 20px;
    box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
}

.payment-container h2 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

.form-section h3 {
    margin-bottom: 10px;
    color: #555;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    font-size: 14px;
    color: #333;
    margin-bottom: 5px;
}

.input-group input {
    width: 100%;
    padding: 8px;
    font-size: 14px;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: border-color 0.3s ease;
}

.input-group input:focus {
    border-color: #007bff;
    outline: none;
}

.pay-btn {
    width: 100%;
    padding: 12px;
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.pay-btn:hover {
    background-color: #218838;
}

@media (max-width: 480px) {
    .payment-container {
        width: 90%;
        padding: 15px;
    }
    .pay-btn {
        font-size: 14px;
    }
}