XF 1.2 how to put fixed floating banner at the bottom ?

[touch]

I would like to put some fixed floating banner at the center-bottom of my forum, which will keep visible when the visitor scrolling the page .. like this one

what code I should use? and how to make it stay in the center of the bottom ?

sorry for my bad english, hope you guys understand what I`m asking here

 

[TsinJu]

You mean an Advert Banner that scrolls while you scroll down the Forum?
If yes and you want to use Google for this you cant because its not allowed...

https://forums.digitalpoint.com/threads/floating-adsense-banner.2478698/
https://support.google.com/adsense/answer/48182?hl=en