Here is an example:
<div id="box">Content</div>
#box {
position: relative;
width: 60%;
background: #ddd;
-moz-border-radius: 4px;
border-radius: 4px;
padding: 2em 1.5em;
color: rgba(0,0,0, .8);
text-shadow: 0 1px 0 #fff;
line-height: 1.5;
margin: 60px auto;
}
#box:before, #box:after {
z-index: -1;
position: absolute;
content: "";
bottom: 15px;
left: 10px;
width: 50%;
top: 80%;
max-width:300px;
background: rgba(0, 0, 0, 0.7);
box-shadow: 0 15px 10px rgba(0, 0, 0, 0.7);
transform: rotate(-3deg);
}
#box:after {
transform: rotate(3deg);
right: 10px;
left: auto;
}
See on JSFiddle. The code is from this page: How to create slick effects with CSS3 box-shadow.
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solved How to create a shadow border in CSS3? [closed]