This my first time deploying a react app with firebase and after seeing a few tutorials I still get the same result . When I click on my firebase url to my website I get this pic instead of my website :

I followed the steps below :
1)cd to my react app
2) npm install firebase-tools -g
3)firebase login
4) firebase init
-hosting setup
What do you want to use as your public directory? build
Configure as a single-page app (rewrite all urls to /index.html)? Yes
Set up automatic builds and deploys with GitHub? No
File build /index.html already exists. Overwrite? No
Skipping write of build /index.html
5) npm run build
6) firebase deploy
So the deployment is succesfull but I do not get my app but this screen instead .