1. install react-bootstrap
npm install react-bootstrap bootstrap
2. import css file in your index.js or app.js
import 'bootstrap/dist/css/bootstrap.min.css';
<link
rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"
crossorigin="anonymous"
/>
3. import components like
import { Button } from 'react-bootstrap';