Angular 4: How to include Bootstrap?

npm install --save bootstrap

afterwards, inside angular-cli.json (inside the project’s root folder), find styles and add the bootstrap css file like this:

"styles": [
   "../node_modules/bootstrap/dist/css/bootstrap.min.css",
   "styles.css"
],

UPDATE:
in angular 6+ angular-cli.json was changed to angular.json.

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