The button of my site stop working

Hello Guys, for some reason when I click in the button of my page, nothing happened.
Is the pink button that says: “habla con nuestros expertos”

Do you experience something similar? What is the best way to start reverse engineer this problem?

Here is my site Read-Only: Lucifer WEB
([how to share your site Read-Only link][2])

It looks like the “Banner” element has its z-index set to -1. This actually means it’s sent under the entire rest of the webpage, so nothing on it can be interacted with. Resetting the z-index to Auto should fix it!