1. Flex-контейнер и потомки
2. Flex-direcrion и оси
3. Flex-wrap
4. Justify-content
5. Align-items
6. Order
7. Flex-basis
8. Flex-grow
9. Flex-shrink
10. Flex
11. Align-self
12. Align-content
13. Example
14. Margin: auto