In General, the essence, there is here a multilevel menu Codepen
you need to make sure that all the ul was the same height, that is adjusted to the highest element. In this example, the height of all ul have to be on a par with "Service 8".
And here's the question no one has encountered such a thing, can it somehow without js you can do (e.g. FlexBox). Or do you need js to write for this case? Certainly not what I would like :(
Thank you all!