This is exactly what we need. webpack is a module bundler. Webpack looks for node_modules in the wrong folder. Setup Bootstrap 4 (Beta 3) With Npm And Webpack. I'm calling it webpack-tutorial. Webpack uses dependency graph to resolve modules which are dependent on one another and build the modules first which are required in some other modules. webpack.config.js. Amaresh already mentioned something, about what I might be missing, but that didn’t help me out with my problem, as I was given no real explanation on why that would help. This is how you configure CSS in your webpack.config.js: module: { rules: [ { test: /\.css$/, use: [ 'style-loader', 'css-loader' ] } ] } The test keyword tells webpack what kind of files should use this loader. In this way when the server starts it will use node_modules from the node_modules folder instead of a minified js file (Why? Make it possible to just avoid webpack to touch a particular require statement and NOT try to resolve it. The css-loader will generated a JS module that exports styles and style-loader will use them to add to the