How to add a class to a component?

Question

React

Good afternoon. Tell me how to solve the problem or refer, please, to the documentation, otherwise I can not find a solution.

There are two components in react. button and menu. It is necessary to make it so that when a button is clicked, a certain class is added and removed from the menu, so that the menu appears and hides. You need to do it through the class. There are styles for media queries.

Thanks to all

Answer 1

Something like this https://codesandbox.io/s/heuristic-currying-jm0ur?...