Can not get css file when unicorn running in production mode

Dear all

I’m newbie to unicorn server.
recently I got a problem when I was trying to run unicorn in production
model.
like command unicorn -E production. then I lost all my css styles in
the browser.
But everything works fine when I just type unicorn

when unicorn running in the production environment, I was trying to
access my css file in the browser by the url
http://127.0.0.1:8080/stylesheets/scaffold.css’, I got 'No route
matches “/stylesheets/scaffold.css”
but it worked fine when unicorn running in the development environment.

Please help me, it’ll be very appreciated.

Best Regards,
Lewis