How can i make animation hamburger icon to x like sololearn navbar icon ?

Question

Is there any way to edit bootstrap nav-icon class and make it?
Or no what can i do?

Answer 1

https://code.sololearn.com/WgVziEkjzTWr/?ref=app

(search for "hamburge" and/or "menu" in web codes for more)

I guess that bootstrap nav-icon are from a specific font-face, so no: I don't think that you can edit them ^^