<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<style>
.wrap {
position: relative;
200px;
border: 1px solid #ccc;
}
.content{
200px;
height: 300px;
overflow: auto;
margin-bottom: 50px;
border: 1px solid #ccc;
}
.item {
100%;
height: 100px;
background: red;
margin-bottom: 10px;
}
.btn {
position: absolute;
bottom: 0;
background: #fff;
100%;
height: 50px;
}
</style>
</head>
<body>
<div class="wrap">
<div class="content">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="btn">按钮</div>
</div>
</div>
</body>
</html>
