626、但愿我们中间不会出现叛徒

div{text-align:center;font-size:2em;margin:20px auto;}

a{display:table;margin:0 auto;text-decoration: none;font-size:0.5em;color:#000;}

</style>

<div>404 Not Found</div>

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<a href="/">5秒钟后返回首页</a>

</body>

</html>