css垂直居中方法（二）

第四种方法：

这个方法把一些div的显示方式设置为表格，因此我们可以使用表格的vartial-align属性。

代码如下：

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
#wrapper {
    display: table;
}

#cell {
    height: 300px;//如果不设置height，效果并不明显，显示的好像是不居中的，但是实际上在wrapper中是居中显示的
    background-color: yellow;
    display: table-cell;
    vertical-align: middle;
}
.content{
  height: 100px;//加上height是为了显示更明显一些
  background-color: red;
}
  </style>
</head>
<body>
    <div id="wrapper">  
      <div id="cell">
        <div class="content">diveeeeeeeeeeeeeeeeeeeeeeeeeeeeeuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuueeeeeeeeeeeee</div>
      </div>
    </div>
</body>
</html>

优点：

content可以动态改变高度。当wrapper里没有足够空间时，content不会被截断

缺点：

Internet Explorer(甚至 IE8 beta)中无效，许多嵌套标签

显示效果如下：