Bootstrap can be downloaded from https://www.w3schools.com/bootstrap/bootstrap_get_started.asp or added to a web page from Bootstrap CDN.
Some of the Bootstrap CSS classes require JavaScript code to work on websites.
The most recent version of Bootstrap at the time of writing is Beta.2.
The example project can be found at https://github.com/polatengin/B05277/tree/master/Chapter18/0-GettingStartedBootstrap.
You should add these lines into the head section of the web page in order to use Bootstrap:
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" ...
