为什么要加position：relative
.menu ul li:hover span{
background:#fff;
display:inline-block;
width:20px;
height:30px;
z-index:20;
position:relative;?????????????
float:right;
}
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.menu ul li:hover span{
background:#fff;
display:inline-block;
width:20px;
height:30px;
z-index:20;
position:relative;?????????????
float:right;
}
2016-08-25
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