You can buy this project and download/modify it how often you want.
ScrollFloater This content does not float. This content does not float. This floater is constrained within a container and has a top offset of 50px. This content does not float. This content does not float. This floater is very tall. This tall floater is pinned to the bottom of the window when your window is shorter and floats at the top when it is taller. This is the bottom of the page.
This tall floater is pinned to the bottom of the window when your window is shorter and floats at the top when it is taller.
This is the bottom of the page.
