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<!DOCTYPE html>
<meta name="viewport" content="initial-scale=10,width=device-width">
<style>
html, body {
margin: 0;
width: 100%;
height: 100%;
scrollbar-width: none;
}
#container {
position: relative;
}
#inner {
position: absolute;
top: 0;
left: 0;
width: 10px;
height: 10px;
background: green;
}
</style>
<div id="container">
<div id="inner"></div>
</div>