How to hide/show the menu in css?

Question

css

Hello
There is a vertical menu https://jsfiddle.net/ixley/zufkd827/
According to the link it is without styles, I think it's not
scary information, namely only Category?
Brand and Link from .sub-menu do not need to be shown.

Answer 1

In general, I did it using jquery
https://jsfiddle.net/ixley/6cf4xf71/