body {
            margin: 0;
            padding: 0;
            background-color: #f4f6f8;
            font-family: Arial, Helvetica, sans-serif;
            color: #333333;
        }
        .container {
            max-width: 600px;
            margin: 0 auto;
            background-color: #ffffff;
            border-radius: 10px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        .header {
            background-color: #0a3d62;
            padding: 20px;
            text-align: center;
        }
        .header img {
            max-width: 180px;
            height: auto;
        }
        .content {
            padding: 25px;
        }
        h1 {
            font-size: 20px;
            color: #0a3d62;
            margin-bottom: 15px;
        }
        p {
            font-size: 15px;
            line-height: 1.6;
            margin-bottom: 15px;
        }
        .highlight {
            background-color: #f89809;
            padding: 12px;
            border-radius: 6px;
            color: #fff;
            font-weight: bold;
            text-align: center;
            margin-bottom: 20px;
        }
        .payment-section {
            background-color: #f1f8ff;
            border: 1px solid #cce5ff;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            margin: 25px 0;
        }
        .payment-section h2 {
            color: #0056b3;
            margin-bottom: 15px;
            font-size: 18px;
        }
        .pay-button {
            display: inline-block;
            background-color: #0a3d62;
            color: #ffffff !important;
            padding: 12px 25px;
            border-radius: 6px;
            font-size: 16px;
            font-weight: bold;
            text-decoration: none;
            margin-bottom: 15px;
            transition: background-color 0.3s ease;
        }
        .pay-button:hover {
            background-color: #07314e;
        }
        .qr-container {
            margin-top: 15px;
            text-align: center;
        }
        .qr-container img {
            max-width: 180px;
            height: auto;
            border: 2px solid #ddd;
            border-radius: 6px;
        }
        .footer {
            background-color: #f1f3f5;
            padding: 15px;
            text-align: center;
            font-size: 13px;
            color: #555;
            border-top: 1px solid #ddd;
        }
        .contact {
            margin-top: 10px;
            font-size: 14px;
            color: #0a3d62;
        }
        a {
            color: #0a3d62;
            text-decoration: none;
        }
        @media screen and (max-width: 600px) {
            .container {
                width: 90%;
            }
            h1 {
                font-size: 18px;
            }
            p {
                font-size: 14px;
            }
            .pay-button {
                width: 100%;
                display: block;
                padding: 14px;
            }
        }