Alright, it’s time to put new features of CSS3 on practice. Do you remember how much of a headache it was to build a “holy grail” layout by using floats or inline-blocks? The part when we needed to stick a footer to the bottom of a browser was a real challenge. But thanks God good guys from w3c decided to help us by introducing the flexbox layout model. I suggest to test it and try to build a holy grail layout using flexbox.