How can i make a mobile navigation using pure css?

I want to make a mobile navigation using css only.
I already know how can i make this using javascript dom but i want to make it pure css.
Some people says that i can use :hover selector, but i had problem with it; when i click on <a> inside the navbar it disapears.
other people says you can use :focus but also it doesn't work.
I tried all these.
Have you another way i can do it? Thanks Alot before. please execuse my English grammer.