Scale image overlay to match body background

Just discovered Webflow… I’m blown away. I wish I had started learning sooner.

I’m not a developer first and foremost, so I apologize if this question is noobish.

What I’m trying to do right now is hover trigger an image overlay that matches the way the background image in my site body scales. I’m sure there are several ways to do this, but I can’t figure it out. It’s not the interaction - I’m using class adder for that. But the scaling. What would be the best way to make two images in the site scale identically, at full width, with one laid on top of the other?

Thanks!

https://smart-mouth.webflow.io/