Flip animations are popular CSS effects that show both the front and the back of an HTML element by turning them from the top to the bottom, or from left to the right (and vice versa). They are rad in 2 dimensions, but they are even cooler when performed in 3D.
To create a 3D button (with Top → Bottom flip), first we stack three <div>s on each other, two for the front and back faces of the button, and a third one for filling the depth in the middle.
