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<!doctype HTML>
<html>
<head>
<style>
html {
background: lightpink;
}
div {
position: relative;
width: 200px;
height: 200px;
background-color: red;
left: 150px;
top: 150px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>