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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
#modified {
left: 10px;
}
</style>
</head>
<body>
<div style="opacity:0.9">
<div style="position:fixed; left:300px; top:300px; width:200px; height:200px; background-color:red; z-index:-10"></div>
<div style="width:200px; height:200px; position:relative; background-color:green" id="modified">
<div style="opacity:0.9">
<div style="position:fixed; left:300px; top:300px; width:200px; height:200px; background-color:green; z-index:-10"></div>
</div>
</div>
</div>
</body>
</html>