Published Jekyll website does not apply theme

I have been following tutorials to create a static website.

I wanted to publish “minima” themed website with just one blog post.

In the repo settings menu I see “Your site is ready to be published at” and I follow the link.

What I see is

If I build the website locally with bundle exec jekyll serve everything works correctly.

What am I missing?

github pages need to be set baseurl: "/project_name"