Live Demo: CSS Box Shadow Effect

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CSS Box Shadow Effect</title>
<style>
    .box{
        width: 150px;
        height: 150px;
        background: #ccc;
        border: 1px solid #999;
    }
    .shadow-inside{
        -moz-box-shadow:    inset 0 0 10px #666; /* for gecko based browsers */
        -webkit-box-shadow: inset 0 0 10px #666; /* for webkit based browsers */
        box-shadow:         inset 0 0 10px #666;
    }
    .shadow-outside{
        -moz-box-shadow:    2px 2px 4px 2px #999;
        -webkit-box-shadow: 2px 2px 4px 2px #999;
        box-shadow:         2px 2px 4px 2px #999;
    }
    .shadow-outside-all{
        -moz-box-shadow:    0 0 6px 3px #999;
        -webkit-box-shadow: 0 0 6px 3px #999;
        box-shadow:         0 0 6px 3px #999;
    }
    .shadow-outside-bottom{
        -moz-box-shadow:    0 10px 5px -5px #999;
        -webkit-box-shadow: 0 10px 5px -5px #999;
        box-shadow:         0 10px 5px -5px #999;
    }
    .example{
        margin: 30px;
    }
</style>
</head> 
<body>
<div class="example">
    <h2>Box Shadow Inside</h2>
    <div class="box shadow-inside"></div>
    <br>
    <h2>Box Shadow Outside</h2>
    <div class="box shadow-outside"></div>
    <h2>Box Shadow Outside - Side All</h2>
    <div class="box shadow-outside-all"></div>
    <h2>Box Shadow Outside - Bottom Only</h2>
    <div class="box shadow-outside-bottom"></div>
    <br>
    <p><strong>Note:</strong> Experiment with the value to see how the box-shadow property works.</p>
</div>
</body>
</html>