Add a "statement" on every page of a website

Hi guys
I was trying to figure out on doing something similar to what thewirecutter.com is doing:

https://cl.ly/0y442i0O0F0w

Adding a "message" that is on the top of every page of a website, like writing the "user value proposition" as they do.

Tried searching online and here, but as I'm not 100% sure on what to search...still didn't find a solution ^_^"

Do you think it's possible in GP Premium?

Thanks a lot for the Support,
have a great day,
Elia