Fixed boxes require absolute positioning to achieve the following effects. I hope there are masters who can achieve the following methods without absolute positioning! Please give me some advice
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
html,
body {
height: 100%;
padding: 0;
margin: 0;
overflow: hidden;
}
.outer {
height: 100%;
padding: 100px 0 0;
box-sizing: border-box;
}
.A {
height: 100px;
background: #BBE8F2;
position: absolute;
top: 0;
left: 0;
width: 100%;
}
.B {
height: 100%;
background: #D9C666;
overflow: scroll;
}
</style>
</head>
<body>
<p class="outer">
<p class="A"> 头部p </p>
<p class="B">
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdfD</p> <p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdfD</p> <p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdfD</p> <p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdfD</p> <p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdfD</p> <p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdfD</p> <p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>abcabsdf</p>
<p>sssssssssssssssssssssss</p>
</p>
</p>
</body>
</html>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
The question is a bit vague. If you require A+B to be equal to the height of outer, you can use
calc(100% - 100px);Floating fixed positioning
I don’t quite understand what you’re asking. Can you be more specific?