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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#float1, #float2 {
width: 100px;
height: 20px;
background-color: green;
margin-right: auto;
}
#spacer {
height: 30px;
}
</style>
</head>
<body>
<div id="container">
<div id="float1"></div>
<div id="spacer"></div>
<div id="float2"></div>
</div>
</body>
</html>