You can change the shadow offset with:
div {
width:80px; height:110px;
background:#3183bd;
-moz-box-shadow: inset 1em 1em 1em -1em #111;
-webkit-box-shadow: inset 1em 1em 1em -1em #111;
box-shadow: inset 1em 1em 1em -1em #111;
}
http://jsfiddle.net/ga6cy/4/
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