1、单列布局
2、单列布局水平居中
.main{width: 800px;height: 300px;background: #ccc;margin: 0 auto;}
3、自适应宽度两列布局（用得比较少）
4、固定宽度两列布局（用得比较多）
两栏被限制在父级div（main）中.
5、自适应三列布局
6、案例：左侧固定200px，右侧固定300px，中间自适应
7、混合布局
8、要点回顾：
其实在网页制作当中，页面中的元素就是块与块之间的关系：
块挨着块；块嵌套着块；块叠压着块
通过css将这些块摆放正确，网页布局就自然完美了。
1、margin:0 auto 自动居中
2、两种分成三栏的方式：
1）两边position：absolute，left：0/right：0，top:0，
中间margin｛0 右边 0 左边｝
2）先分两栏 左右float 再分两栏左右float
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