How to make a responsive css3 menu for mobile devices?

Question

css

Hi all!
Please tell me how to make an adaptive menu for mobile devices, without js, only with css.
For PC versions of the menu is not needed!

Answer 1

at https://jsfiddle.net/driver/xzpnzb3j/

Answer 2

And what is the difficulty?
We create a CSS menu and hide it on large screens via a media query.
If you want ready-made code, then hardly anyone will write it for you.
Moreover, it's not clear what menu you need.