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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Overflow reference</title>
<style>
html,
body {
margin: 0;
}
.expected {
position: fixed;
inset: 0;
box-sizing: border-box;
width: 100vw;
height: 100vh;
background: green;
font: 16px / 32px serif;
}
</style>
<div class="expected">Hello</div>