1.盒子垂直居中的方法
#box{
400px;
height:400px;
position:absolute;
top:50%;
left:50%;
margin-left:-200px;
margin-top:-200px;
background:#000;
}
2.CSS实现首尾高度固定、中间高度自适应的DIV布局
<!doctype html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>Document</title>
</head>
<body>
<div class="con">
<div class="top"></div>
<div class="md"></div>
<div class="bottom"></div>
</div>
<style>
*{margin:0; padding:0;}
html,body,.con{height:100%;100%;height:100%;100%;}
div{position:absolute;}
.top,.bottom{100%;height:100px;z-index:5;}
.top{background:red;top:0;}
.bottom{background:black;bottom:0;}
.md{
100%;
background:#a7fad7;
overflow:auto;
top:100px;
bottom:100px;
position:absolute;
_height:100%;
_border-top:-100px solid #eee;
_border-bottom:-100px solid #eee;
_top:0;/*http://www.cnblogs.com/ckmouse/archive/2012/02/14/2351043.html*/
}
</style>
</body>
</html>
3.多行文字垂直居中
li{
display:table;
}
li>span{
display:table-cell;
vertical-align:middle;
}
4.设置图片宽度100%，高度等于宽度
img{
100%;
height:0;
padding-bottom:100%;
}