Positioning Flex. How to do it right?

Question

css

I'm learning about flexbox and ran into a bit of a misunderstanding of positioning.
In the example on the link, I have a page where there are Left and Right blocks.
How do I scatter them on the right side and on the left?
https://jsfiddle.net/zrr4q0tr/

Answer 1

https://jsfiddle.net/zrr4q0tr/1/ - right?
If you need 2 in a row, then https://jsfiddle.net/zrr4q0tr/3/