How to align flexbox tiles?

Question

css

Hello again!
I'm using flexboxes and I can't understand them yet...)))
In general, the problem is of such a plan. There is a block with news. There is news lead - it occupies the entire left side and 2 small ones that go under each other. Here is the layout

THANK YOU!!! for helping with the grid, to my question about tiles , but now another hell has begun.))
and it looks like I can't control the width! (and in theory there should be an adaptive) for descendants who are small news ...
codepen.io/emelyanova/pen/rWEYbd - that's how it is now. Those. the width of small news is not controlled... Although it is set.
How to proceed here? Where did I go wrong? What didn't you learn? What to repeat and learn?
Thanks in advance!

Answer 1

The width is perfectly controlled using flex-basis and flex-grow/flex-shrink
from here everything is written in Russian