老师看一下哪里错误？

来源：3-5 编程练习

前后1

2020-05-06 00:10:14

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>全屏的云南旅游相册</title>
  <link rel="stylesheet" type="text/css" href="css/index.css"/>
  <script type="text/javascript" src="js/JQuery.js"></script>
  <script type="text/javascript" src="js/index.js"></script>
</head>
<body>
  <span></span>
  <nav>
   <a href="#">泸沽湖</a>
   <a href="#">丽江古城</a>
   <a href="#">茶马古道</a>
   <a href="#">就这家·云逸客栈</a>
   <a href="#">西双版纳</a>
   <a href="#">云南红酒庄</a>
   <a href="#">轿子雪山</a>
   <a href="#">普者黑</a>
   <a href="#">海埂大坝</a>
   <a href="#">玉龙湾</a>
   <a href="#">昆明郊野公园</a>
   <a href="#">欧洲风琴小镇</a>
  </nav>
  <div>
   <img src="img/1.jpg">
   <img src="img/2.jpg">
   <img src="img/3.jpg">
   <img src="img/4.jpg">
   <img src="img/5.jpg">
   <img src="img/6.jpg">
   <img src="img/7.jpg">
   <img src="img/8.jpg">
   <img src="img/9.jpg">
   <img src="img/10.jpg">
   <img src="img/11.jpg">
   <img src="img/12.jpg">
  </div>
</body>
</html>

*{
margin:0;
padding:0;
border:none;
}
html,body{
overflow:hidden;
height:100%;
background:#93b3c36;
}
span{
display:block;
width:16px;
height:16px;
margin:30px auto 40px;
border-radius:50%;
background:#fff;
}
nav{
position:relative;
display:flex;
width:78.125vw;
margin:0 auto 45px;
justify-content:space-between;
}
nav:before{
position:absolute;
top:20px;
display:block;
width:100%;
height:10px;
content:"";
background:#fff;

}
nav > a{
font-size:20px;
position:relative;
padding:10px;
text-decoration:none;
color:#255d7e;
border:2px solid #5395b4;
background:#fff;
}
div{
positon:relative;
overflow:hidden;
width:78.125vw;
height:75vh;
margin:0 auto;
background:#fff;
bo-shadow:0 0 30px 0 rgba(8,1,3.3);
}
div > img{
position:absolute;
top:0;
right:0;
bottom:0;
left:0;
width:98%;
height:96%;
margin:auto;
}