FlexBox, or Flexible Box, is a CCS3 layout mode that arranges the elements in a way that they behave predictably when the page changes to accommodate varying screen sizes. With the web going responsive, it's definitely nice to see new standards appearing to aid developers in that. It does not rely on floats and some might find it easier to use than the more traditional display modes. The Flexbox layout can alter it's children's width and/or height to best fill what's on the screen. And I'll mention now, that Bootstraps Grid layout model is probably more versatile in this regard, but this is true CSS way to go about the issue. Also the flex layout is still in the Candidate Recommendation stage, so we'll have to use corresponding browser prefixes in order to be more compliant.