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<!DOCTYPE html>
<html>
<head>
<style>
body { margin: 0 }
div.ref {
border: 1px solid black;
box-sizing: border-box;
background: green;
height: 50px;
width: 100px;
}
</style>
</head>
<body>
<div class="ref"></div>
</body>
</html>