console
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width, viewport-fit=cover"
/>
<meta name="format-detection" content="telephone=no" />
</head>
<body>
<div class="div">
<div class="div1">
<br>1
<br>2
<br>3
<div class="a">123123</div>
<br>4
<br>5
</div>
</div>
</body>
</html>
.div {
position: absolute;
overflow-x: hidden;
overflow-y: scroll;
top: 0;
left: 0;
right: 0;
bottom: 0;
}
.div1 {
height: 2000px;
}
.a {
position: fixed;
top: 10px;
left: 10px;
}