Header section is broken.

working on it

I am already working on it

I noticed that while I was actively working on this issue, you assigned it to yourself without prior discussion. For collaborative integrity, please remember to assign an issue to yourself first if you’re planning to work on it, and check if someone else is already tagged. It's considered courteous—and aligns with Drupal’s contribution guidelines—to communicate with the current assignee before reassigning or untagging others.
Changing assignments without communication can be seen as unprofessional, so let's ensure we’re all working transparently. Thank you for your understanding and cooperation!

Hello,

This is very intentional. This theme was built to have no opinion about how the page header and menu should be styled.

The purpose of this theme is to be a starting point that can be extended with a sub-theme that will handle tasks like styling the headers and menus. I have updated the description for this theme to hopefully clarify the intent.

Marking won't fix.