body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #007bff;
            color: #fff;
            margin: 0;
            padding: 20px;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .container {
            background-color: #fff;
            color: #333;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            text-align: center;
        }
        .form-group label {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .btn-classic {
            background-color: #007bff;
            color: white;
            border: none;
            width: 100%;
            margin-top: 12px;
            padding: 12px;
            font-size: 16px;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .btn-classic:hover {
            background-color: #0056b3;
        }
        #qrcode {
            margin-top: 20px;
            text-align: center;
        }
        .form-control {
            margin-bottom: 12px;
            border-radius: 5px;
            padding: 10px;
            font-size: 16px;
        }
        .btn-group {
            margin-top: 20px;
            display: flex;
            justify-content: center;
            gap: 10px;
        }
        .btn-secondary {
            background-color: #6c757d;
            color: white;
            border: none;
            padding: 12px;
            font-size: 16px;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .btn-secondary:hover {
            background-color: #5a6268;
        }