<!DOCTYPE html>
<script>
if (window.internals)
internals.useMockOverlayScrollbars();
</script>
<div id="container" style="width: 200px; height: 200px; overflow: scroll">
<div id="content" style="position: relative; background: green; width: 300px; height: 100px; will-change: transform"></div>
<div style="height: 210px"></div>
</div>