Firefox scollbar goes nuts when Chart.js is present

[arechsteiner]

On pages with Chart.js, the scroll bar on Firefox/Win10 can go into a wild frenzy if the viewport is exaclty the right height, i.e. at the frontier of having a vertical scroll bar.

https://www.reddit.com/r/webdev/comments/aos736/i_created_an_open_source_admin_template_with/eg3hwsz/