CSS goes inside the <style></style> section. This:
<h1>
CAMPER CAFE
</h1>
is HTML. You weren’t supposed to move that. You were supposed to add the correct CSS in the style section.
If you don’t know how to do that, read the instructions and see what property they suggest using and do what developers do when they can’t remember something - google it.
If you need more help, please ask a specific question, explaining what is confusing you.