scroll-thumb-minimum-size-theme-ref.html
<!DOCTYPE html>
<div style="width: 200px; height: 200px; overflow: scroll;">
<div style="width: 100000px; height: 1000000px"></div>
</div>
<!DOCTYPE html>
<div style="width: 200px; height: 200px; overflow: scroll;">
<div style="width: 100000px; height: 1000000px"></div>
</div>