Why does my shadow seem to cut off?

Head out to http://loosecannonfitness.com/mobile/hammons.php.

Now take a look at this graphic...


You'll notice where I've got my arrow pointing there appears to be an abrupt "edge" to the shadow effect I've got on my stylesheet that looks like this (http://loosecannonfitness.com/mobile/css/stylesheet.css):

.conclusion {
margin-top:35px;
margin-left:10px;
width:655px;
height:auto;
padding:10px;
border: solid #cccccc 1px;
color:#000000;
box-shadow: 5px 5px 10px #cccccc;
border-radius: 15px;
}

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Why do I have that "edge" and how can I achieve the shadow effect all around the perimeter of my box?