How could i add an age verifier pop up

Hey everyone!
Im working with a client that has a cannabis business in LA and he would like to add an age verifier so people can select if they are over 18 or not.

any help is appreciated

Do you already have a form design I can look at?

http://vetsleaf.webflow.io/

this is what the site look like right now - i would like to add a pop up as soon as they go in that basically ask the user it’s age.

something similar to this but not as complex

I don’t see any popup form on that page, please design one first before asking for code help.

I have the same question. So i’m curious about the possibilities.