title: How to import CSS from node_modules in webpack angular2 app
body: <p>Let's say that we start with the following starter pack:
  <a href="https://github.com/angularclass/angular2-webpack-starter" rel="noreferrer">https://github.com/angularclass/angular2-webpack-starter</a></p>
  
  <p>After <code>npm install</code> and <code>npm run start</code> everything works fine.</p>
  
  <p>I want to add an external css module, for example bootstrap 4's css (and only the css). (I know that bootstrap has a bootstrap-loader, but now I'm asking for general solution, so please think about bootstrap 4 here as it could be any other css module that is available via npm).</p>
  
  <p>I install bootstrap via npm: <code>npm install bootstrap@4.0.0-alpha.4 --save</code></p>
  
  <p>First I thought that it is enough to add <code>import 'bootstrap/dist/css/bootstrap.css';</code> to the vendor.browser.ts file.</p>
  
  <p>But it isn't.</p>
  
  <p>What should I do to have a proper solution?</p>
  
  <p>Solutions I'm NOT asking for:</p>
  
  <ol>
  <li>"Copy the external css module to the assets folder, and use it from there"
  
  <ul>
  <li>I'm looking for a solution that works together with npm package.</li>
  </ul></li>
  <li>"Use bootstrap-loader for webpack"
  
  <ul>
  <li>As I described above, I'm looking for a general solution, bootstrap is only an example here.</li>
  </ul></li>
  <li>"Use another stack"
  
  <ul>
  <li>I'm looking for a solution in the exact starter pack that I've mentioned above.</li>
  </ul></li>
  </ol>