css3 纸张效果 边框阴影

[css]代码库

ul .box {
	position: relative;
	z-index: 1; /* prevent shadows falling behind containers with backgrounds */
	overflow: hidden;
	list-style: none;
	margin: 0;
	padding: 0;
}
ul .box li {
	position: relative;
	float: left;
	width: 250px;
	height: 150px;
	padding: 0;
	border: 1px solid #efefef;
	margin: 0 30px 30px 0;
	background: #fff;
	-webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27), 0 0 40px rgba(0, 0, 0, 0.06) inset;
	-moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27), 0 0 40px rgba(0, 0, 0, 0.06) inset;
	box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27), 0 0 40px rgba(0, 0, 0, 0.06) inset;
}
ul .box li:before,  ul.box li:after {
	content: '';
	z-index: -1;
	position: absolute;
	left: 10px;
	bottom: 10px;
	width: 70%;
	max-width: 300px; /* avoid rotation causing ugly appearance at large container widths */
	max-height: 100px;
	height: 55%;
	-webkit-box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
	-moz-box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
	box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
	-webkit-transform: skew(-15deg) rotate(-6deg);
	-moz-transform: skew(-15deg) rotate(-6deg);
	-ms-transform: skew(-15deg) rotate(-6deg);
	-o-transform: skew(-15deg) rotate(-6deg);
	transform: skew(-15deg) rotate(-6deg);
}
ul .box li:after {
	left: auto;
	right: 10px;
	-webkit-transform: skew(15deg) rotate(6deg);
	-moz-transform: skew(15deg) rotate(6deg);
	-ms-transform: skew(15deg) rotate(6deg);
	-o-transform: skew(15deg) rotate(6deg);
	transform: skew(15deg) rotate(6deg);
}

[代码运行效果截图]