How to run react build as layout?

Question

React

Good afternoon.
I have created my own small react app and want to show it to a friend.
I wrote in the terminal npm run build

I know that then you can install serve and run build through it.

But, I just want to drag the build folder to my hosting and attach it to the technical domain, this is temporary.

Only if I open index.html from build it opens a white page.

Thanks in advance for the hint.