为什么都要设置relative呢
container{ float:left;
position:relative;
left:50%}
.container ul{
list-style:none;
margin:0;
padding:0;
position:relative;
left:-50%;
container{ float:left;
position:relative;
left:50%}
.container ul{
list-style:none;
margin:0;
padding:0;
position:relative;
left:-50%;
2016-11-11
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