Foundation Lesson 142 | Vertically Aligning in Flexbox
У вашего броузера проблема в совместимости с HTML5
CSS is awesome. Well, most of of the time. For some reason, vertically aligning content (especially when a parent element doesn’t have a height) is a pain requiring all kinds of hacks and display: table; nonsense. It takes something that is seemingly simple and makes it confusing and painful. Luckily, Flexbox solves many of the common layout issues we face in CSS and float grids. In this lesson, you’ll learn how to use Flexbox to solve vertical centering in your projects: http://zurb.us/2eNJ7r1