CSS - Gargioni/Project-SdG GitHub Wiki

Documentação

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference

http://devdocs.io/css/

Escolas Online

http://pt-br.learnlayout.com/

https://www.codecademy.com/pt-BR/learn/web

https://developer.mozilla.org/en-US/Learn/CSS

http://www.w3schools.com/css/

https://www.codeschool.com/courses/css-cross-country

Comunidades

https://www.reddit.com/r/css

https://www.reddit.com/r/csshelp