How to make thumbnail interaction only appear on hover

Hi there hopefully you can help me out, I am new to interactions and working off a template.

I would like the “see case study” circle to show only when I hover over the “Case” container. I simply cannot figure it out, and I know it must be fairly simple to do. Could one of you kindly point me in the right direction?

Thank you!

Here is my public share link: [LINK]1

This is strange. When I test in preview initially, the effects do not work. However, as soon as I open the interaction and click one of the “Hover circle looping content” and then go back to preview, it works. I don’t change anything to the interaction. The act of opening it seems to make it work somehow. Possible to try this and then publish? Then share you published link?