被重写的属性在CSS Style中会以删除线标示
css class 优先级
结论：若同时应用多个class，后定义的优先（即近者优先），加上!important最优先！ color: #0000FF!important;
CSS z-index 属性
z-index 属性设置元素的堆叠顺序。拥有更高堆叠顺序的元素总是会处于堆叠顺序较低的元素的前面。
注释：元素可拥有负的 z-index 属性值。
注释：Z-index 仅能在定位元素上奏效（例如 position:absolute;）！
http://css-tricks.com/css-sprites/
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