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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.shadowed {
box-shadow: 0 0 35px rgba(0, 0, 0, .9);
border: 1px solid lightgray;
margin: 0 2em;
float: left;
}
</style>
</head>
<body style = "overflow:hidden">
<div class="shadowed" style="height: 200vh"> long shadow </div>
</body>
</html>