<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
div {
width: 500px;
height: 500px;
background-color: #ff0000;
/* display:inline-block;text-align: center; */
margin: 0 auto;
}
</style>
}
</head>
<body>
<div></div>
</body>
</html>
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