‘404 not found’ error showing on vercel deployment

Guys seems like there is an issues while deploying my web audio player app to vercel

The project is located here –
https://github.com/blazeinferno64/blaze-audio-player

I didn’t used any frameworks instead I just used plain HTML CSS and JavaScript code to make my web app

Also there isn’t any custom backend

Can someone help me?

I tried adding vercel.json file but it didn’t seem to work!