Plugin "Compress" navigation like in bootstrap?

Question

Design

Hi all.
There is a navigation bar. It has different links. the problem is that if the user is sitting, for example, on the phone, it looks crooked and the links go to each other.
How can I make them shrink into a drop down menu? as in the picture:

// I have a "custom" template. Designed without any CSS frameworks

Answer 1

Here's a good breakdown of the implementation. The third example is like in bootstrap.
https://css-tricks.com/responsive-menu-concepts/