now.json

{
  "name": "use-system-theme",
  "builds": [
    {
      "src": "examples/create-next-app/package.json",
      "use": "@vercel/next"
    },
    {
      "src": "examples/create-react-app/package.json",
      "use": "@vercel/static-build"
    }
  ],
  "build": {
    "env": {
      "PUBLIC_URL": "/create-react-app"
    }
  },
  "routes": [
    {
      "src": "/create-react-app/(.*\\.(json|js))",
      "dest": "examples/create-react-app/$1"
    },
    {
      "src": "/create-react-app/static/(.*)",
      "dest": "examples/create-react-app/static/$1"
    },
    {
      "src": "/create-react-app/{0,1}(.*)",
      "dest": "examples/create-react-app/"
    },
    {
      "src": "/create-next-app/{0,1}(.*)",
      "dest": "examples/create-next-app/$1"
    },
    {
      "src": "/(.*)",
      "dest": "examples/create-next-app/$1"
    },
    {
      "src": "/(.*)",
      "dest": "examples/create-next-app/"
    }
  ]
}