Custom slider fixed background

He guys,

I hope you can help me out. I would like to achieve the following.

I created a slider with a colored background and an image. If I click on next or previous, I would like to slide the image but the background has to change color and not slide with the image. Is this possible?

This is my example:

Here is my site Read-Only:
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Here is the principle:


Sharing link:

Thanks a lot! I’m going to try this.