<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
  @page {
    margin: 0;
  }
  :root {
    print-color-adjust: exact;
  }
  body {
    margin: 0;
  }
</style>
<div style="margin:0 4em;">
  <div style="height:4em; background:lime;"></div>
  The background of the top page margin area should be lime.
</div>
