I've just completed freeCodeCamp's HTML & CSS Responsive Web Design course and i've seen this in other people's portfolio's and would love to learn how to do it but i don't know what it's called. I'll give examples: https://activetheory.net/home https://lusion.co/ The game Escape From Tarkov also has this on its main menu.

CodePudding user response：

you're probably referring to parallax.

I believe this will help you: https://dev.to/clementgaudiniere/create-a-parallax-effect-when-the-mouse-moves-3km0