'my deloyed Heroku app only dislays "Welcome to your new app" message and nothing else

I have been trying to use Heroku for an already existing REACT app. As mentionned on the website I used the command line for an existing git repository $ heroku git:remote -a art-shop-at.

I don't get any error message but when I type heroku open it doesn't display my entire website but on a welcome message.

As mentionned on another post on the subject, I tried to specify the port with port = process.env.PORT || 3000 but it's not working out.

If that can help feel free to check the repo in question : https://github.com/agnestshibangu/art-shop

Thank you !



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