Well this is embarrassing...
You're currently on a web browser that does not support the most recent version of the CSS Flexible Box Model.
Upgrade your browser and have a nice day!

Safari 7+

Internet Explorer 11

Chrome 29+

Opera 12.1

Safari 6.1+ prefixed

Chrome 21+

Firefox 23+


View full table of support for Flexbox on Can I use...
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Flexbox support (March 2014):

IE 11+ unprefixed

Chrome 29+ unprefixed

Firefox 28+ unprefixed

Opera 12.1+ unprefixed

Safari 6.1+ prefixed