头尾固定-中间部分可滚动-布局：
<!DOCTYPE html>
<style>
*{
margin: 0;
padding: 0;
}
body{
display: flex;
flex-direction: column;
height: 100vh;
}
#top{
height: 50px;
background: red;
}
#center{
flex: 1;
height: 100%;
overflow-y:auto;
}
.center{
height: 200vh;
background: pink;
}
#bottom{
height: 50px;
background: green;
}
</style>
<body>
<div id="top">头部</div>
<div id="center">
<div class="center">中间</div>
</div>
<div id="bottom">底部</div>
</body>
![Android 时间轴的实现[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)