<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>系统升级</title>
    <style>
        html, body, div, h1, * {
            margin: 0;
            padding: 0;
        }

        body {
            background-color: #fefefe;
            color: #222;
        }

        .box {
            width: 380px;
            margin: 0 auto;
        }

        h1 {
            font-size: 20px;
            text-align: center;
            background: 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no-repeat top center;
            background-size: 100px 100px;
            padding-top: 110px;
            margin-top: 50%;
            font-weight: normal;
        }
    </style>
</head>
<body>
    <div class="box">
        <h1>系统升级中，请稍后访问！</h1>
    </div>
</body>
</html>