why my bootstrap carousel is not working in react code example

Example 1: react bootstrap carousal not working

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

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

Example 2: react bootstrap carousel not working

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css">