undo.html 403 Bytes

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>暂未开发</title>
</head>
<style>
  html, body {
    width: 100%;
    height: 100%;
  }
  .tip {
    width: 100px;
    height: 50px;
    line-height: 50px;
    text-align: center;
  }
</style>
<body>
  <div class="tip">暂未开发</div>
</body>
</html>