Button onClick event not work

My site builds and deploys correctly, but buttons with onClick event don’t work on the Netlify: theme switch button, hamburger button on small screen… Please let me know how to fix them. Thanks in advance.

My site: https://magical-bublanina-02c332.netlify.app/
Git repository: GitHub - HoaLeMinh/omgtalentgroup: learning nextjs

This doesn’t look like a Netlify issue. I’m unable to get your repo working locally as well. I just ran npm run dev and it fails with Internal Server Error.