<!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>
body {
height: 100%;
}
.box1 {
position: fixed;
width:100px;
height: 100px;
background: blue;
}
.box2 {
width: 50px;
height: 50px;
background: red;
}
</style>
</head>
<body>
<div class="box1"><div class="box2"></div></div>
</body>
</html>
pardon110
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