Marco Kuiper on Twitter: "CSS flexbox is awesome, but needs prefixes. @prefixfree can help you out http://t.co/sFl4Ctoic0 @zomigi #fronteers13 http://t.co/yrusXaB0Kd" / Twitter
html - Why is -webkit-box-flex not being overridden in Chrome and Firefox? - Stack Overflow
CSS box-shadow Property
CSS Box Model | Examples to see How the Box-Model works?