How to remove empty space on bottom of homepage

Hi, I'm trying to create a very simple homepage with just a large header image that covers the whole page. But in the bottom of my homepage I have some empty black space right underneath the header image and I want to remove it. How can I do that? Here's my site: https://mosaicstories.app/ Below the header image there should be just the line & then footer with copyright info, but not all that black space thanks so much!