How to run reactjs project on server without having port

Firstly im sorry for my english grammar...

Ok so i already run my react on website but when i type the site i need to even put :3000 after the url... If it's running on site i don't want to put port on the url. Can anyone help me on how to run react without the port on site?

it should look like this... example.site.com not like example.site.com:3000

If you need any details tell me on comments. THANKS ON ADVANCE!!!