Three blocks on top of each other with rubber imposition. How to make same height using css?

Question

css

Good day comrades.
There is a block with a slider. It is divided into two parts: the slider itself on the left, and 3 horizontal blocks on the right.
Essence of a question: at change of width the height of a slider changes. The blocks on the right should also change height and it should be the same for all 3. Can this be done with css? Or just keep track of window.resize and recalculate the height with jquery ?

Answer 1

flex can do this