change size of font awesome icon react

1const React = require('react')
2import { Form, FormControl, FormGroup, ControlLabel, Col, Button, Tooltip, OverlayTrigger } from 'react-bootstrap'
3import FaFolderOpen from 'react-icons/lib/fa/folder-open'
4import FaFileCodeO from 'react-icons/lib/fa/file-code-o'
5import FaFolderOpen from 'react-icons/lib/fa/folder-open'
6import FaFileCodeO from 'react-icons/lib/fa/file-code-o'
7
8<Button type="button" bsStyle="success" block onClick={(e) => folderChooser(e)}>
9     <FaFolderOpen />
10</Button>