On [this website](http://www.readyto.watch/), on Chrome, when hovering or clicking the "EXPLORE" button, I am getting a lot of weird shadowed boxes popping up in random places. What could this be from? I have inspected the elements but it doesn't seem that any of them could be causing these. 

A screenshot below:

![enter image description here](https://i.stack.imgur.com/gf0uB.png)