SOURCE

<ul class="test">
	<li class="outset">外阴影常规效果<br />box-shadow:5px 5px rgba(0,0,0,.6);</li>
	<li class="outset-blur">外阴影模糊效果<br />box-shadow:5px 5px 5px rgba(0,0,0,.6);</li>
	<li class="outset-extension">外阴影模糊外延效果<br />box-shadow:5px 5px 5px 10px rgba(0,0,0,.6);</li>
	<li class="inset">内阴影效果<br />box-shadow:2px 2px 5px 1px rgba(0,0,0,.6) inset;</li>
	<li class="multiple-shadow">外阴影模糊效果<br />box-shadow:5px 5px 5px rgba(0,0,0,.6);</li>
</ul>

.test li {
	margin-top: 20px;
	list-style: none;
	width: 400px;
	padding: 10px;
	background: #eee;
}
.test .outset {
	box-shadow: 5px 5px rgba(0, 0, 0, .6);
}
.test .outset-blur {
	box-shadow: 5px 5px 5px rgba(0, 0, 0, .6);
}
.test .outset-extension {
	box-shadow: 5px 5px 5px 10px rgba(0, 0, 0, .6);
}
.test .inset {
	box-shadow: 2px 2px 5px 1px rgba(0, 0, 0, .6) inset;
}
.test .multiple-shadow {
	box-shadow:
		0 0 5px 3px rgba(255, 0, 0, .6),
		0 0 5px 6px rgba(0, 182, 0, .6),
		0 0 5px 10px rgba(255, 255, 0, .6);
}