https://css-tricks.com/
http://www.thefloatingfrog.co.uk/frog-blog/2008/09/10-css-shorthand-techniques-youll-use-everyday/
http://www.cssnolanche.com.br/quotes-com-css/
http://www.noupe.com/better-design/7-css-hacks-you-cannt-live-without.html
http://meiert.com/en/blog/20081111/5-css-tips/
http://www.brookgroup.com/Resources/Design-and-Usability/CSS-Best-Practices.html