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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#float-blue {
float: left;
margin-right: 40px;
background-color: blue;
width: 40px;
height: 100px;
}
.float-green {
float: left;
margin-right: 40px;
background-color: green;
width: 40px;
height: 100px;
}
</style>
</head>
<body>
<div id="float-blue"></div>
<div class="float-green"></div>
<div class="float-green"></div>
</body>
</html>