The flexbox-related CSS is backwards

[Michael Martin]

Instead of using floats by default and only using flexbox if modernizr detects it, we should use flexbox by default and fall back to floats if modernizr doesn't detect support.

[Michael Martin]

Nevermind. The full-width class is already overriding floats. Floating will still need to be default, so it doesn't really make sense to override it with full-width, then override the override (to set it back to default) with .no-flexbox &.full-width.

We can make things more clear by moving those styles to the top. We should also get rid of flexbox and only use flexbox-legacy since we aren't using the new syntax yet.