My pens on Codepen:
Solved By Flexbox:
Flexbox Frogy!
Flexy Boxes:
http://the-echoplex.net/flexyboxes/
Flexplorer:
http://bennettfeely.com/flexplorer/
Putting Flexbox into practice:
http://zomigi.com/downloads/Putting-Flexbox-Into-Practice_Blend-Conf_130907.pdf
S’mores: