title: Build Reactjs blank page and not generated other pages
body: <p>I am newbie in reactjs, just create my first reactjs app, I want to make production version, and used this command:</p>
  
  <pre><code>npm run build
  </code></pre>
  
  <p>But in generated just a blank index.html file, why? Because I have many routes , how can I access other pages? and why index is blank?</p>
  
  <pre><code>{
    "name": "test",
    "version": "0.1.0",
    "private": true,
    "dependencies": {
      "axios": "^0.19.0",
      "express": "latest",
      "nodemon": "^2.0.1",
      "react": "^16.9.0",
      "react-dom": "^16.9.0",
      "react-router-dom": "^5.0.1",
      "react-scripts": "3.1.0",
      "semantic-ui-css": "^2.4.1",
      "semantic-ui-react": "^0.88.1",
      "socket.io": "^2.3.0"
    },
    "scripts": {
      "start": "react-scripts start",
      "build": "react-scripts build",
      "test": "react-scripts test",
      "eject": "react-scripts eject"
    },
    "eslintConfig": {
      "extends": "react-app"
    },
    "browserslist": {
      "production": [
        "&gt;0.2%",
        "not dead",
        "not op_mini all"
      ],
      "development": [
        "last 1 chrome version",
        "last 1 firefox version",
        "last 1 safari version"
      ]
    },
    "devDependencies": {
      "universal-cookie": "^4.0.2"
    }
  }
  </code></pre>