Too much space between Header and Main Content

Hi, I replaced the regular header in the Twenty Fourteen theme with a custom one to match my site’s header. I also did some other customization (full width, etc.) I use a child CSS and files to do this. I am stuck with some extra padding between the header and the main content. Try as I might, I can’t figure out how to reduce that space. Any help would be appreciated. Here’s the site: https://als-ny.org/blog/ Thanks.