http://wtfhtmlcss.com/
http://codepen.io/soulwire/pen/bKens/
https://autoprefixer.github.io/
http://codepen.io/sevilayha/pen/IdGKH
https://codepen.io/enxaneta/full/adLPwv
https://ihatetomatoes.net/how-to-create-css-glitch-effect
http://purecssapple.com/
https://codepen.io/surjithctly/pen/pLDwe
https://robots.thoughtbot.com/css-animation-for-beginners
https://nekocalc.com/px-to-rem-converter
http://navnav.co
http://uigradients.com/