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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.separator, #fieldset {
height: 20px;
background-color: green;
}
#spacer {
padding: 20px 0;
}
</style>
</head>
<body>
<div class="separator"></div>
<div id="spacer">
<div id="fieldset"></div>
</div>
<div class="separator"></div>
</body>
</html>