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<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<style>
html, body {
margin: 0;
width: 100%;
height: 100%;
}
div {
position: absolute;
}
</style>
<div style="background: red; width: 100%; height: 100%;"></div>
<div style="background: green; width: 50%; height: 50%;"></div>