I really, really hate the modern trend of scrollbar design. I guess it makes some amount of sense if you're aiming for a mobile phone factor, where real estate is somewhat limited, but changing the scrollbar from a widget that lives functionally outside of the content it is scrolling to a translucent show-only-on-hover widget that overlays the content (and can thus become functionally invisible if the content is just the wrong color) is a real step backwards in UI design.
I finally got frustrated enough to go in and manually increase the default scrollbar size in Firefox. Slim scrollbars are awful both to look at and to use. I'm working with an ultrawide monitor here, please give me more than 0-3 pixels of scrollbar!