 {
            background-color: white;
            padding: 15px;
            border-radius: 8px;
            display: inline-block;
            margin: 0 auto 1rem auto;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            border: 1px solid #f0f0f0;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>测试二维码模态框</h1>
        <p>点击下面的按钮打开二维码模态框</p>
        
        <div class="btn" id="donateTrigger">
            <i class="f