不用图片而用css3实现一些阴影特效

一些阴影效果用图片实现也许是以前我们常用的一种方法，不过现在用css3一些属性也可以实现阴影效果，今天做了一个例子；

html代码如下：

<div class="container">
<h1><a href="/css-drop-shadows-without-images/">CSS drop-shadows without images</a></h1>

<div class="drop-shadow lifted">
<p>Lifted corners</p>
</div>

<div class="drop-shadow curled">
<p>Curled corners</p>
</div>

<div class="drop-shadow perspective">
<p>Perspective</p>
</div>

<div class="drop-shadow raised">
<p>Raised box</p>
</div>

<div class="drop-shadow curved curved-vt-1">
<p>Single vertical curve</p>
</div>

<div class="drop-shadow curved curved-vt-2">
<p>Vertical curves</p>
</div>

<div class="drop-shadow curved curved-hz-1">
<p>Single horizontal curve</p>
</div>

<div class="drop-shadow curved curved-hz-2">
<p>Horizontal curves</p>
</div>

<div class="drop-shadow lifted rotated">
<p>Rotated box</p>
</div>
</div>

css样式如下：

body {
padding:20px 0 30px;
font:14px/1.5 Arial, Helvetica, sans-serif;
text-align:center;
color:#333;
background:#FAF0D9;
}
a {
font-weight:bold;
color:#346aa8;
}
a:hover, a:focus, a:active {
text-decoration:none;
}
.container {
position:relative;
z-index:1;
width:600px;
padding:20px;
margin:0 auto;
background:#FAF0D9;
}
.container:after {
content:"";
display:block;
clear:both;
visibility:hidden;
height:0;
font-size:0;
}
.drop-shadow {
position:relative;
float:left;
width:40%;
padding:1em;
margin:2em 10px 4em;
background:#fff;
-webkit-box-shadow:0 1px 4px rgba(0,0,0,0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
-moz-box-shadow:0 1px 4px rgba(0,0,0,0.3), 0 0 40px rgba(0,0,0,0.1) inset;
box-shadow:0 1px 4px rgba(0 ,0,0,0.3), 0 0 40px rgba(0,0,0,0.1) inset;
}
.drop-shadow:before, .drop-shadow:after {
content:"";
position:absolute;
z-index:-2;
}
.drop-shadow p {
font-size:16px;
font-weight:bold;
}
.lifted {
-moz-border-radius:4px;
border-radius:4px;
}
.lifted:before, .lifted:after {
bottom:15px;
left:10px;
width:50%;
height:20%;
max-width:300px;
max-height:100px;
-webkit-box-shadow:0 15px 10px rgba(0 ,0 ,0,0.7);
box-shadow:0 15px 10px rgba(0 ,0 ,0,0.7);
-moz-box-shadow:0 15px 10px rgba(0 ,0, 0,0.7);
-webkit-transform:rotate(-3deg);
-moz-transform:rotate(-3deg);
-ms-transform:rotate(-3deg);
-o-transform:rotate(-3deg);
transform:rotate(-3deg);
}
.lifted:after {
right:10px;
left:auto;
-webkit-transform:rotate(3deg);
-moz-transform:rotate(3deg);
-o-transform:rotate(3deg);
-ms-transform:rotate(3deg);
transform:rotate(3deg);
}
.curled {
border:1px solid #efefef;
-moz-border-radius:0 0 120px 120px / 0 0 6px 6px;
border-radius:0 0 120px 120px / 0 0 6px 6px;
-webkit-border-radius:0 0 120px 120px / 0 0 6px 6px;
}
.curled:before, .curled:after {
bottom:12px;
left:10px;
width:50%;
height:55%;
max-width:200px;
max-height:100px;
-webkit-box-shadow:0 8px 12px rgba(0,0,0,0.5);
-moz-box-shadow:0 8px 12px rgba(0,0,0,0.5);
box-shadow:0 8px 12px rgba(0, 0, 0, 0.5);
-webkit-transform:skew(-8deg) rotate(-3deg);
-moz-transform:skew(-8deg) rotate(-3deg);
-ms-transform:skew(-8deg) rotate(-3deg);
-o-transform:skew(-8deg) rotate(-3deg);
transform:skew(-8deg) rotate(-3deg);
}
.curled:after {
right:10px;
left:auto;
-webkit-transform:skew(8deg) rotate(3deg);
-moz-transform:skew(8deg) rotate(3deg);
-ms-transform:skew(8deg) rotate(3deg);
-o-transform:skew(8deg) rotate(3deg);
transform:skew(8deg) rotate(3deg);
}
.perspective:before {
left:80px;
bottom:5px;
width:50%;
height:35%;
max-width:200px;
max-height:50px;
-webkit-box-shadow:-80px 0 8px rgba(0,0,0,0.4);
box-shadow:-80px 0 8px rgba(0,0,0,0.4);
-moz-box-shadow:-80px 0 8px rgba(0,0,0,0.4);
-webkit-transform:skew(50deg);
-moz-transform:skew(50deg);
-o-transform:skew(50deg);
-ms-transform:skew(50deg);
transform:skew(50deg);
-webkit-transform-origin:0 100%;
-moz-transform-origin:0 100%;
-ms-transform-origin:0 100%;
-o-transform-origin: 0 100%;
transform-origin:0 100%;
}
.perspective:after {
display:none;
}
.raised {
-webkit-box-shadow:0 15px 10px -10px rgba(0,0,0,0.5), 0 1px 4px rgba(0 ,0,0,0.3), 0 0 40px rgba(0,0,0,0.1) inset;
box-shadow:0 15px 10px -10px rgba(0,0,0,0.5), 0 1px 4px rgba(0 ,0,0,0.3), 0 0 40px rgba(0,0,0,0.1) inset;
-webkit-box-shadow:0 15px 10px -10px rgba(0,0,0,0.5), 0 1px 4px rgba(0 ,0,0,0.3), 0 0 40px rgba(0,0,0,0.1) inset;
}
.curved:before {
top:10px;
bottom:10px;
left:0;
right:50%;
-webkit-box-shadow:0 0 15px rgba(0,0,0,0.6);
-moz-box-shadow: 0 0 15px rgba(0,0,0,0.6);
box-shadow: 0 0 15px rgba(0,0,0,0.6);
}
.curved-vt-2:before {
right:0;
}
.curved-hz-1:before {
top:50%;
bottom:0;
left:10px;
right:10px;
-moz-border-radius:100px/10px;
border-radius:100px/10px;
}
.rotated {
-webkit-box-shadow:none;
-moz-box-shadow:none;
box-shadow:none;
-webkit-transform:rotate(-3deg);
-moz-transform:rotate(-3deg);
-ms-transform:rotate(-3deg);
-o-transform:rotate(-3deg);
transform:rotate(-3deg);
}
.rotated > :first-child:before {
content:"";
position:absolute;
z-index:-1;
top:0;
bottom:0;
left:0;
right:0;
background:#fff;
-webkit-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
-moz-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}

支持的浏览器主要有：Firefox 3.5+, Chrome 5+, Safari 5+, Opera 10.6+, IE 9+

预览效果如下图：