Blocs comes with various animation features, however, Scroll FX are probably the most captivating as they allow you to animate objects on screen and have those animations synced with the scrolling of a page, this style of animation effect is commonly referred to as parallax.
Applying Scroll FX
Applying parallax scroll effects is incredibly easy in Blocs. When an element is selected on the design Canvas, various, easy to use controls that let you set key animation values for the selected element are available within the sidebar inspector.
In and Out Events
Scroll FX are broken into two main option sets, Scroll In and Scroll Out. The Scroll In options control how an element is animated as the page is scrolled down and the element comes into view. The Scroll Out options control how an element is animated as the page is scrolled up and the element goes out of view.