Customize Footer in Fruitful Theme

Envato Customers Web and Code
1

I am trying to customize the footer in the Fruitful theme by putting code in the “Custom CSS” field in “theme options” . When I click save and preview the page, nothing happens.

I’m simply trying to get a 3-column, full width footer with dark background that I can edit like this:
image

What am I doing wrong?

2

Ask the theme author for support. These are general forums.