How do I make the lower section to slowly cover my hero upon scroll?

Hi!

How do I make the lower section to slowly cover my hero section upon scroll?

Thanks in advance.


Here is my site Read-Only: **https://preview.webflow.com/preview/slicksites?utm_medium=preview_link&utm_source=dashboard&utm_content=slicksites&preview=52a51baf538763ac5d308b4eb6930ac0&mode=preview[2])