What is the animation effect?

Hello!
What is the effect when one moans statics, and on the right scrolls turning blocks?
Example future.aic.ru where on the left the numbers 01,02,03,04 and right scroll content
March 23rd 20 at 19:30
1 answer
March 23rd 20 at 19:32
Solution
there's just a sidebar have position: sticky; and the script adds class ="active", which changes the styles of the figures on the page scroll. No tricks.
And the second part, the one that skalitsa? It basically - Mckenna.Morisset commented on March 23rd 20 at 19:35


set more styles for the buttons and stick to the script - robin9 commented on March 23rd 20 at 19:38

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