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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>The div should have a white filling.</title>
<style>
html, body {
margin: 0;
padding: 0;
}
html {
background-color: white;
}
body {
padding: 10px;
}
div {
width: 50px;
height: 50px;
box-sizing: border-box;
border: 1px solid black;
}
</style>
<div></div>