I try to build a web application using nextjs 14,

after following some documentation I still cannot figure out how to do it properly,

this is my next.config.js

const nextConfig = {
  output: 'export',
  trailingSlash: true,
  images: {
    unoptimized: true,
    remotePatterns: [
      {
        protocol: 'https',
        hostname: 'github.com',
        pathname: '**',
      },
    ],
  },
};

I have problem loading the css and js that required in the web, it come in the folder named _next but when called it say 404.

how to resolve the 404 for the required file?
thank you.