How do I change the normal H1

I remember seeing in a Webflow video how one element was selected and you cluld change all the elements but I dont know how I can do this when I try this myself. I don’t remember in what video it was.
To boil it al down I just want to make a change to all H1 headers on my site, and all H1 headers that I will be adding.

Hi @Dit_Ben_Ik_Pouw, you can find all the necessary information here: