More websites these days are utilizing a custom scroll bar on the side. I would like to submit this feature request in this forum as I have tried the wix support and cannot find a category to put it in. This could easily be an exclusive for paid customers. Could have different design styles like rounded, curved, sharp diamond-esque, invisible (hovering mouse shows it) and of course the colour palette.
This is no means credit to me as there already is a post in corvid here: https://www.wix.com/corvid/forum/community-discussion/editing-the-scrollbar