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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
fieldset {
height: 20px;
margin: 0 0 20px;
padding: 0;
border: none;
background-color: green;
}
</style>
</head>
<body>
<fieldset></fieldset>
<fieldset></fieldset>
<fieldset></fieldset>
</body>
</html>