app.py

from flask import Flask, send_from_directory

app = Flask(__name__, static_folder='build', static_url_path='')

@app.route('/')
def serve():
    return send_from_directory(app.static_folder, 'index.html')

@app.route('/<path:path>')
def static_proxy(path):
    return send_from_directory(app.static_folder, path)

if __name__ == '__main__':
    app.run(host="0.0.0.0", port=7860)