How can I implement such a layout using Flexbox?

Question

css

Good afternoon!
Is it possible to implement such a layout using Flexbox?

What we have: there are large blocks that occupy about 2/3 of the screen and small blocks for 1/3 of the screen. All blocks are different heights. It is necessary that the blocks are stacked like Masonry tiles and there is a minimum of free space at the same time.

Answer 1

codepen.io/anon/pen/jrXGRA?editors=1100

Answer 2

https://medium.com/@_jh3y/how-to-pure-css-masonry-...