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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<style>
#target {
height: 200px;
width: 200px;
position: relative;
background-color: rgba(128, 64, 0, 0.5);
}
</style>
<body>
<div id="target"></div>
</body>
</html>