Always visible scrollbar for inline image caption on hover

Hi Community - 

I've been trying to figure out how to make the scrollbar for an inline image caption on hover to appear on hover instead of only appearing upon hover + scrolling over the text. I want to have the scrollbar  visible on hover so the viewer knows there is more content to scroll through. As it is currently, the viewer would only know there is scrollable content if they happen to scroll while hovering over the image caption. I'm using Squarespace 7.1.

Any help would be really appreciated!

Thanks

Can you share link to page where you use image? We can  check easier