给列表中的li添加hover效果,不起作用
<diyclass="header-nav">
manro</span
<ul class=header-nav-right"
<1i><ahref="">首页</1i>
<1i><ahref="">迈若</1i>
<1i><ahref="">服务</1i>
<1i><ahref="">案例</1i>
<1i><ahref="">新闻</1i>
<ahref="">联系</1i>
</u1>
.header-nav-right>li::beforef
Content:
display: block;
width:92px
height:4px;
background-color: 口#eb3a2b;
position:absolute
left:0;
top:56px
/*Z-index: 2:*
opacity:0
header-nav-right>li:hover li::beforef
opacity:1;
求解答