<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>练习 网站导航</title>
    <style>
              *{
  margin:0;
  padding:0;
  list-style:none;
 }
  header,nav,section,footer{
width: 800px;
margin:0 auto;
border:1px solid #000;
}
header{
height: 100px;
}
nav{
height: 40px;
margin:5px auto;
}
section{
height: 500px;
padding:10px;
width: 780px;
}
aside{
width: 200px;
height: 480px;
border:1px solid #000;
float: left;
}
article{
width: 550px;
height: 480px;
border:1px solid #000;
float: right;
}
footer{
height: 80px;
margin-top: 10px;
}
    </style>
     <script src="js/jquery-3.3.1.js"></script>
</head>
<body>


<header>头部</header>
    <nav>导航</nav>
    <section>
    <aside>侧边栏</aside>
        <article>文章</article>
    </section>
    <footer>底部</footer>
    <script>
$(document).ready(function(e) {
           
        });
    </script>
</body>
</html>