Parallax Effect with fixed main image in the middle

I would like to improve my webdev skills and try out some cool animation effects. However I need the name of the animation I want to learn. Could you tell me how the effect on this webpage is called?

https://www.silberpfeil.com/en/products/classic#intro

Once you scroll the energy drink can keeps being in the middle while the background changes. What is this called? Googling Parallax wont help since I only get normal Parallax Effect Tutorials.

Thanks