The best css sample website i feel

I wanted to know some common sense and feeling of web design, So i spend some time to get css/html/js knowledge introduction website by google. ^_^ There are two site that i feel a bit of good and maybe some use of you.

1: There are very many css sample and they almost are free.
www.cssimport.com
2: Another css sample website.
http://www.my3w.org/
3: Are you want to get more fashion button.
http://buttonr.com/