The main site is about teaching web technologies. They used Discourse as forum which is heavily customized.
The first looks familiar as a Chinese user.
- grey body with high contrast header
- round button, avatars and code blocks
- grey header text, I don’t like this.
- no table border, I don’t like this, either.
- user card, hmm, only if there is no background image.
- quote looks nice, so does code block
- Take a look at input focus style.