import bootstrap in react

1.run command in cmd
npm install react-bootstrap bootstrap

2.after install add this to index.js
import 'bootstrap/dist/css/bootstrap.min.css';

//You may want to add individual components like 'Navbar',
 // or 'Button' rather than the entire library.
3. add this, or similar to the js files that would be using the individual components
import {Navbar, Nav, Button} from 'react-bootstrap';

{/* The following line can be included in your src/index.js or App.js file*/}

import 'bootstrap/dist/css/bootstrap.min.css';