My free ultra minimalist wordpress theme, please review

Here’s the URI: https://fortelle.no/wordpress/

The idea was to create a theme that’s as simple as possible while still looking presentable. It’s mostly something I did as a learning exercise, so I would really like some feedback on my code as well.

here’s the php: https://wordpress.pastebin.ca/2147531

and here’s the css: https://wordpress.pastebin.ca/2147532