css阴影详解之Box-shadow修饰性属性详解

box-shadow:（inset）2px 2px 5px #000;

<div style="
box-shadow:2px 2px 5px #000;
border-radius:10px;
">
</div>

<div style="
box-shadow:0px 0px 10px #000;
border-radius:10px;
">
</div>

<div style="
box-shadow:0px 0px 10px 10px #000;
border-radius:10px;
">
</div>

<div style="
box-shadow:0px 0px 10px -10px #000;
border-radius:10px;
">
</div>

<div style="
box-shadow:0px 0px 0px 3px #000,
           0px 0px 0px 6px #2e56bf,
           0px 0px 0px 9px #ea982e;
border-radius:10px;
">
</div>

<div class="box shadow"></div>
<style>
.box {  margin:10px auto;
	width: 180px;
	height: 90px;
	background: #ccc;
	border-radius: 10px;
}
.shadow {
	position: relative;
	max-width: 270px;
	box-shadow: 0px 1px 4px rgba(0,0,0,0.3),
	0px 0px 20px rgba(0,0,0,0.1) inset;
}
.shadow::before,
.shadow::after {
   content:"";
   position:absolute;
   z-index:-1;
}
.shadow::before,
.shadow::after {
   content:"";
   position:absolute;
   z-index:-1;
   bottom:15px;
   left:10px;
   width:50%;
   height:20%;
}
.shadow::before,
.shadow::after {
   content:"";
   position:absolute;
   z-index:-1;
   bottom:15px;
   left:10px;
   width:50%;
   height:20%;
   box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);
   transform:rotate(-4deg);
}
.shadow::after{
   right:10px;
   left:auto;
   transform:rotate(3deg);
 }
</style>