All templates include bootstrap v4 components and some additional ones:
A general bootstrap theme optimized for general use.
A template optimized for documentation pages.
Add Bootlaterus that already includes bootstrap CSS (to see additional themes go here):
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootlaterus@latest/dist/css/bootlaterus-cfonts.min.css" crossorigin="anonymous">
Include additional javascript libraries (JS, Popper, and jQuery):
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
You can install bootlaterus using NPM:
npm install bootlaterus --save