Interaction Design Collapsible header,navigation & scroll button

Step 2 of my learning of Principle App is this Low fidelity website that I created in principle.
I have made...
-Navigation in a menu that you can click on and it will scroll to different parts of the website.
- Back to top button that appears when you scroll down.
- Collapsible header, so when you scroll down it shrinks.

Hope you like it :)