Tutorial Stack of Paper

body {
background: #666;
}
.papers {
background-color: white;
height: 350px;
padding: 20px;
width: 260px;
-webkit-box-shadow:
1px 1px 0 rgba(0, 0, 0, 0.100),
3px 3px 0 rgba(255, 255, 255, 1.0),
4px 4px 0 rgba(0, 0, 0, 0.125),
6px 6px 0 rgba(255, 255, 255, 1.0),
7px 7px 0