东西坏了先想着修，而不是换
margin: 0 auto;
}
<h1>Welcome to tengine!</h1>
<head>
</head>
body {
</style>
<!DOCTYPE html>
For online documentation and support please refer to
<html>
</body>
<body>
<style>
If you see this page, the tengine web server is successfully installed and
<em>Thank you for using tengine.</em>
</html>
font-family: Tahoma, Verdana, Arial, sans-serif;
working. Further configuration is required.
<title>Welcome to tengine!</title>
width: 35em;
<a href="http://tengine.taobao.org/">tengine.taobao.org</a>.
