Navbar menu links not working on mobile mode

Hi.
I purchased the Academics template. Deployed this template on my server and found that the navbar menu links are not working on mobile mode (narrow width screen mode).

Deployed the template code here.
https://flyze201.com/academics/index.html

No response at all on iPhone, Android, and even on the desktop browser when I make the browser window narrower to activate the mobile mode.
Any help will be appreciated. Thanks.