http://oocss.org/
2、reset.css
http://meyerweb.com/eric/tools/css/reset/
3、normalize.css
https://necolas.github.io/normalize.css/
4、neat.css
http://www.neatcss.com/
参考：
http://www.jikexueyuan.com/course/802_4.html?ss=1