.upi-container { max-width: 400px; margin: 0 auto; padding: 20px; background: #fff; border-radius: 12px; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1); font-family: Arial, sans-serif; color: #333; } .amount-buttons button { margin: 5px; padding: 10px 15px; border: none; background-color: #0070c9; color: white; border-radius: 5px; cursor: pointer; } .amount-buttons button:hover { background-color: #005aa7; } input[type="text"] { width: 100%; padding: 10px; margin-top: 10px; border-radius: 5px; border: 1px solid #ccc; } button#submitPayment { background-color: #28a745; color: white; padding: 10px; border: none; border-radius: 5px; margin-top: 10px; cursor: pointer; }