webpack.config.js

module.exports = {
  entry: './index.js',

  output: {
    filename: 'bundle.js',
    publicPath: ''
  },

  module: {
    loaders: [
      { test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader?presets[]=es2015&presets[]=react' },
      {
      test: /\.css$/, // Only .css files
      use: ['style-loader','css-loader' ]// Run both loaders
      }
    ]
  }
}