<html>
<head>
<title>Shoot ’em up</title>
<style type="text/css">
#game {
width: 640px;
height: 420px;
background-color: red;
}
#ducks {
}
.duck {
width: 64px;
height: 64px;
background-color: blue;
}
</style>
</head>
<body>
<div class=game>
<div class=ducks>
<div class=duck></div>
</div>
</div>
</body>
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</html>