Bootstrap

After you create the frontend project using this project

$ npm install bootstrap

Then you will see something like this in the package.json

{
  "dependencies": {
    "bootstrap": "^5.3.0"
  }
}

Import Bootstrap in src/application/app.js

import "bootstrap/dist/js/bootstrap.bundle";

Import Bootstrap SCSS in src/styles/index.scss

// If you comment out code below, bootstrap will use red as primary color
// and btn-primary will become red

// $primary: red;

@import "~bootstrap/scss/bootstrap.scss";

That is it, you can run npm run watch and check the result in the browser.

Reference

https://getbootstrap.com/docs/5.0/getting-started/webpack/