盒子模型
1.盒子模型的组成：margin border padding content；
2.border:
在属性值的设置中，如果给出2个属性值，前者表示上下边框的属性，后者表示左右边框的属性；如果给出3个属性值，前者表示上边框，中间表示左右边框，后者表示下边框；如果给出4个属性值，按照上，右，下，左的顺序。设置背景的时候，浏览器覆盖的区域是content,padding,border。
2.margin：
1）需要记录的是水平的margin是相加，垂直方向的margin会造成塌陷，采用较大的margin。
2）嵌套盒子的margin：子块会以父块的content为参考。
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