In the background, there could be various cosmic/space themed effects that are tied to scroll percentage for example planetary/satellite orbits around planets which also move with a parallax scroll effect (as the dark blue background shapes do on the current site:
In the background, there could be various cosmic/space themed effects that are tied to scroll percentage for example planetary/satellite orbits around planets which also move with a parallax scroll effect (as the dark blue background shapes do on the current site: