sticky示例说明：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
list-style: none;
text-decoration: none;
}
.container{
width: 80%;
height: 1000px;
margin: 0 auto;
}
.header{
width: 100%;
height: 200px;
position: sticky;
top: 0px;
background: red;
}
.content{
width: 100%;
height: 2000px;
background: hotpink;
}
</style>
</head>
<body>
<div class="container">
<div class="header">
</div>
<div class="content">
</div>
</div>
</body>
</html>
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