react bootstrap

                                    */ npm install react-bootstrap bootstrap 
import 'bootstrap/dist/css/bootstrap.min.css';

import Button from 'react-bootstrap/Button';

// or less ideally
import { Button } from 'react-bootstrap';

<>
  <Button variant="primary">Primary</Button>{' '}
  <Button variant="secondary">Secondary</Button>{' '}
  <Button variant="success">Success</Button>{' '}
  <Button variant="warning">Warning</Button>{' '}
  <Button variant="danger">Danger</Button> <Button variant="info">Info</Button>{' '}
  <Button variant="light">Light</Button> <Button variant="dark">Dark</Button>{' '}
  <Button variant="link">Link</Button>
</>

                                    {/* The following line can be included in your src/index.js or App.js file*/}
import 'bootstrap/dist/css/bootstrap.min.css';

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

                                    ### Installation ###
npm install react-bootstrap@next [email protected]

                                    npm install react-bootstrap [email protected]

                                    npm install react-bootstrap bootstrap

                                    1.run following commnad in cmd:
npm install bootstrap --save

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