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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>文件预览</title>
</head>
    <style>
        html, body {
        width:100%;height:100%; text-align:center;vertical-align:middle;margin:0px;padding:0px;
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        body {
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align-items: center;
justify-content: center;
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        max-height:100%;max-width:100%;vertical-align:middle;
        }
    </style>
<body>
<asp:Literal ID="LitBody" runat="server" />
</body>
</html>