'footer animation with button

The issue I have having is a need to build a footer that only appear when you have scrolled to the bottom of the page. then once at the bottom the footer animates up. It is no problem if it over laps what is on the bottom. I also need a button in the top right corner so that the footer goes back down and disappears. My client wants what https://yorkcapital.com/ has... you sometimes have to scroll down and force it to comes up by trying to scroll down more. Ive never created a footer like this... Please help. I just never thought about using a footer this way. please please help. thanks everyone!



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