<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title></title>
<style>
body,p{margin: 0;}
h2{margin: 0;font-size:100%;}
ul{margin: 0;padding: 0;list-style: none;}
input{margin: 0;width: 0;}
a{text-decoration: none;color:inherit;}
.box{width: 572px;border: 1px solid #999;overflow: hidden;}
.nav{margin-left: -1px;font: 14px "微软雅黑";overflow: hidden;background-color: #f1f1f1;}
.navI{float: left;width: 33.333%;box-sizing: border-box;}
.navI-tit{display:block;line-height: 40px;text-align: center;cursor: pointer;border-left: 1px solid #cecece;border-bottom: 1px solid #cecece;}
.navI-txt{position:relative;width: 572px;height:200px;text-indent:2em;line-height: 2;background:#fff;}
.ml1{margin-left: -100%;}
.ml2{margin-left: -200%;}
/*重点代码*/
.navI-radio{display:none;}
.navI-radio:checked + .navI-tit{background:#fff;border-bottom:none;}
.navI-radio:checked ~ .navI-txt{z-index:1;}
</style>
</head>
<body>
<div class="box">
<ul class="nav">
<li class="navI">
<input class="navI-radio" name="nav" type="radio" id="kc" checked>
<label class="navI-tit" for="kc">课程</label>
<p class="navI-txt">课程内容</p>
</li>
<li class="navI">
<input class="navI-radio" name="nav" type="radio" id="xx">
<label class="navI-tit" for="xx">学习计划</label>
<p class="navI-txt ml1">学习计划内容</p>
</li>
<li class="navI">
<input class="navI-radio" name="nav" type="radio" id="jn">
<label class="navI-tit" for="jn">技能图谱</label>
<p class="navI-txt ml2">技能图谱内容</p>
</li>
</ul>
</div>
</body>
</html>
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