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<!DOCTYPE html>
<html>
<head>
<style>
#parent {
width: 200px;
height: 200px;
margin-left: 10px;
background: green;
}
#child {
width: 90px;
height: 90px;
background: red;
}
</style>
</head>
<body>
<div id="parent">
<div id="child"></div>
</div>
</body>
</html>