Q:

Scrolling with a button which should have a fixed position

I am trying to get a button to work which should keep on scrolling. The website is http://mkg-praxisklinik-muenchen.de/. It is the green button "Termin vereinbaren" on the bottom left side. This should stay sticky (fixed position) while I am scrolling the page.
The problem is that if the page is too short the button does not appear at all - as also on responsive designs.
I have tried all the known css workarounds without success. Does anybody know of a javascript solution?

A:

When using position: fixed, you need to set a position property like top,bottom,left,right
In this case, all i did was add 
bottom: 50px;

and it works like you expected it to. 
Also, no need for margins when you are using positioning.
I also noticed you have a relative container, probably not the best way to go about a fixed element. I would remove the container all together.

