老师，有地方需要优化吗？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
/* 在此处补充代码*/
*{
padding:0;
margin:0;
}
ul{
list-style: none;
}
img{
display: block;
}
header{
height:100px;
display:flex;
justify-content: space-around;
align-items:center;
background:black;
}
.logo{
flex-basis:80px;
}
.nav{
height:100%;
flex-basis:300px;
color:white;
display:inline-flex;
justify-content: space-between;
align-items:center;
}
.login{
flex-basis:130px;
height:100%;
display:flex;
justify-content: space-around;
align-items:center;
}
.login input{
background:orange;
height:20px;
width:50px;
border-radius:5px;
}
section{
height:400px;
display: flex;
flex-wrap:wrap;
justify-content: space-around;
align-content:space-around;
}
.section{
background:#f01400;
border-radius:10px;
height:150px;
width:45%;
display: flex;
justify-content: space-around;
align-items:center;
}
.box{
display: flex;
flex-direction: column;
justify-content: space-around;
height:80%;
}
.shopping{
display: flex;
width:90px;
height:30px;
justify-content: center;
align-items:center;
background:orange;
border-radius:5px;
font-size:14px;
}
</style>
</head>
<body>
<!-- 头部 -->
<header>
<div class="logo">
<img src="http://img1.sycdn.imooc.com/climg//59197ab000014f1503000100.jpg" alt="">
</div>
<ul class="nav">
<li>课程</li>
<li>路径</li>
<li>猿问</li>
<li>手记</li>
</ul>
<div class="login">
<input type="button" value="登录">
<input type="button" value="注册">
</div>
</header>
<!-- 主体内容 -->
<section>
<div class="section">
<div class="box">
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<div class="shopping">
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<div class="section">
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<div class="section">
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<p>《HTML5月CSS3实现动态网页》</p>
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</div>
<div class="shopping">
<div class="btn">加入购物车</div>
</div>
</div>
<div class="section">
<div class="box">
<p>《HTML5月CSS3实现动态网页》</p>
<div>适用人群：有html和css基础的童鞋</div>
<div>费用：￥599</div>
</div>
<div class="shopping">
<div class="btn">加入购物车</div>
</div>
</div>
</section>
</body>
</html>
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