2-4为什么不设置boxthree:margin-right:50%,那些导航项就不会显示呢?
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{margin:0;
padding:0;
}
.boxone{
width:900px;
height:100px;
left:50%;
top:50%;
margin-top:-50px;
margin-left:-450px;
background:black;
position:absolute;
overflow:hidden;
}
.boxthree ul li{
list-style:none;
line-height:100px;
margin-right:30px;
color:white;
float:right;
line-height:100px;
};
.boxthree{margin-left:50%;}
img{float:left;}
</style>
</head>
<body>
<div class="boxone">
<img src="http://img1.sycdn.imooc.com/climg//58c0d2d900016ce303000100.png">
<div class="boxthree">
<ul>
<li>课程</li>
<li>职业路径</li>
<li>实践</li>
<li>猿问</li>
<li>手记</li>
</ul>
</div>
</div>
</body>
</html>
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