Different backgrounds for repeater

I’m having trouble with
This might be sort of a basic / stupid issue but I’ve tried everything I can think of but I’m having trouble getting different gradient backgrounds in a repeater.

Working in
Wix Studio Editor, for reference, I’m practicing on the “What set’s us apart” section of:

What I’m trying to do
When someone uses the nav buttons a different GRADIENT background will appear.

What I’ve tried so far
The only way I’ve been able to get a gradient was to make the item and repeater bg transparent in all boxes and change the cell bg to a gradient but that just changes the bg to one single gradient.

There is no option to make the “item” or “vector art into a gradient in the design section.

I tried to make the gradient in Illustrator and replace the vector on each box but Wix will not allow the svg,

I tried using CSS

Extra context
See screenshot: