▲ Synthwave Mountains Scroll Animation Header Using Trig.js at codepen.io▼1 up and 0 down, posted by idevgames 167 days ago 3 comments
MaxArt 132 days ago. link parent 1 point ▲ ▼It can absolutely be done in CSS, both the "smooth" part (I suppose you mean easing the movement) and the different speed. I've seen that done by Bramus Van Damme and Temani Afif, among others.