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Test Info:

<html>
<head>
<style>
div.neg
{
margin: 35px auto 95px auto;
width: 200px;
height: 200px;
box-shadow: 0px 0px 15px -20px #808080 inset;
}
</style>
</head>
<body>
<div class="neg"></div>
</body>
</html>