I know it may sound like a silly question, but I don't know how to do it. I made a cookie banner in Javascript. So a simple banner where the user can accept or reject cookies, and once received, the banner disappears. Here everything works fine, and saving cookies works. But I was wondering how to go about making a banner like this:

How does this banner technically work, and how does it manage cookies? I have not found anything about it, so I assume it works like the "traditional" banner (accept all or refuse). Thanks so much