Overlay scrollbars so big that objects behind them cannot be selected
Ubuntu 19.04 & Gnome 3.32.1
Overlay scrollbars are so big that content behind them is obscured and cannot be accessed. For example, font sizes cannot be selected in Libreoffice, or removable drives cannot be ejected in Nautilus.
I have tried other themes, and I have tried editing the gtk css in the theme, which can change the appearance of the scrollbars considerably, but not their width. See the attached screenshot for an example, showing a scrollbar in Nautilus which is ridiculously and unecessarily wide.