Their website is amazing! At least on mobile. Does anyone know the name of the "effect" that makes the entire page seem "closer" to the screen? As in, with no d

Their website is amazing! At least on mobile. Does anyone know the name of the "effect" that makes the entire page seem "closer" to the screen? As in, with no depth and... I don't know to describe it... but the general feel of the pages makes it feel a lot snappier. It's like the entire page is a single pane.