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<!DOCTYPE html>
<html>
<style>
body {
height: 4000px;
margin: 0;
overflow: hidden;
}
#fixed {
position: fixed;
top: 50px;
left: 50px;
width: 100px;
height: 100px;
box-sizing: border-box;
border: 1px solid blue;
}
</style>
<div id="fixed"></div>
</html>