Hi, @mich.wu. I took a look at the README.md file in the repo your site is linked to (which is a public repo). That readme says this:
Separate client/server
The boilerplate is also set up to host the client using
webpack-dev-server
with hot module reloading etc. To use this method, in one terminal run:npm run client
and in the other:
npm run server
The client will be available on http://localhost:8080 and the server on http://localhost:3000. Note that you will still need to manage CORS between the two, as they are on different ports.
This implies that this app requires running a server. Maybe could you confirm if that is true or not.
If it is true, then this support guide has more information:
If there are questions after reading that support guide, please let us know.