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固定的盒子需要绝对定位才能实现以下效果，希望有不需要绝对定位实现以下方法的大神！求指点
<!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>
<div class="outer">
<div class="A"> 头部DIV </div>
<div class="B">
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<p>sssssssssssssssssssssss</p>
</div>
</div>
</body>
</html>
html5
问题有点模糊，如果是要求A+B等于outer的高度，可以用
calc(100% - 100px);