I’m working on a personal portfolio website and have implemented a hamburger menu for mobile views. The hamburger menu works perfectly on my index.html page, but it doesn’t function on any of the other pages like about.html or research.html.

The menu hamburger appears on both mobile and desktop when I shrink the window. The problem is that its functionality does not work and nothing happens when I click on it. Ultimately, when clicked, a menu should expand. Any help on this topic welcome.