Resources

• Good overview
  https://css-tricks.com/snippets/css/a-guide-to-flexbox/
• MDN: Comprehensive coverage
  https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout
• Some uses of flexboxes
  http://philipwalton.github.io/solved-by-flexbox/
• Browser bugs
  https://github.com/philipwalton/flexbugs
• Auto-prefixing
  https://github.com/postcss/postcss
  https://github.com/7rulnik/postcss-flexibility
• Polyfills (use flexibility, flexie is out of date)
  https://github.com/10up/flexibility