How to remove the page header without top of page disappearing under menu bar

I’ve been experimenting with removing the page headers from my shop isle site by adding the following code in Additional CSS:

.page-header-module.module.bg-dark { display: none; }
section.module { padding: 30px 0; }

This removes the header but then the tops of the pages disappear under the top banner. How do I correct / compensate for that?

The page I need help with: [log in to see the link]