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<!DOCTYPE html>
<html>
<head>
<style> 
#example1 {
  border: 1px solid;
  padding: 10px;
  box-shadow: 5px 10px inset;
}
#example2 {
  border: 1px solid;
  padding: 10px;
  box-shadow: 5px 10px 20px red inset;
}
</style>
</head>
<body>
<h2>box-shadow: 5px 10px inset:</h2>
<div id="example1">
  <p>The inset keyword changes the shadow to one inside the frame.</p>
</div>
<h2>box-shadow: 5px 10px 20px red inset:</h2>
<div id="example2">
  <p>Inset, red and blur.</p>
</div>
</body>
</html>