Broken button that doesn’t work when I click on it

i have a navigation menu the 3 lines thing and when I click above it, it opens the menu but when I actually click the navigation button it doesn’t work how would I fix this

I just want the button to get fixed and pull up the menu
https://github.com/DrZebr/Portfolio-Web
that’s the link to the repository if anyone would like to help me please go to that