Discussion on Vitality - One Page Bootstrap 4 Theme

I do not have anything set up for this yet, but it is something that could be easily created with a Bootstrap modal!

Easily <-- Surely for you ;-)))

Could you give me a bit more of a tip how I could do that. What modal could I use or where could I find it?
The website visitor would need to agree to the terms and conditions so he would have to click on something. I am not sure how this is done.

You could just drop in a dismissable alert somewhere on the page.

http://getbootstrap.com/docs/4.1/components/alerts/#dismissing

Check those out. It wouldn't need to pop up or anything, but you could keep it in a fixed position at the bottom of the page.