Here's a FIDDLE
#container {
position: relative;
width: 450px;
height: 600px;
margin: 0 auto;
}
.sheet {
background: #fff;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
box-shadow: 0 0 3px 0 #666;
-moz-box-shadow: 0 0 3px 0 #666;
-webkit-box-shadow: 0 0 3px 0 #666;
}
.sheet:nth-child(1) {
transform: rotate(5deg);
-moz-transform: rotate(5deg);
-webkit-transform: rotate(5deg);
}
.sheet:nth-child(2) {
transform: rotate(-10deg);
-moz-transform: rotate(-10deg);
-webkit-transform: rotate(-10deg);
}