Links and styles are broken for project sites

If I have a different page in zzz.github.io and I use this template to create another github pages website in zzz.github.io/blog, I would expect that the links would be like zzz.github.io/blog/something.html. Instead, I get zzz.github.io/something.html.

Changing baseurl in _config.yml seems to do nothing. I tried adding {{ site.baseurl }} to where ever it is appropriate but a lot of links are still broken.