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<!DOCTYPE HTML>
<html>
<body style="background:rgb(0,0,0);">
<div style="position:fixed;left:0;top:0;width:200px;height:300px;background:rgba(255,255,255,0.5);">
<div style="margin-top:200px;height:100px;background:rgb(0,0,0);"></div>
</div>
</body>
</html>