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<!DOCTYPE html>
<html style="height: 100%">
<body style="height: 100%">
<fieldset style="position: relative; display: table; width: 50%;
height: 50%; top: 25%; left: 25%">
<div style="position: absolute; left: 0; right: 0; top: 0; bottom: 0;
background: green"></div>
</fieldset>
</body>
</html>