add css & style loader

webpack.config.js

@@ -18,7 +18,11 @@ module.exports = {
   module: {
     rules: [
       { test: /\.tsx?$/, loader: "ts-loader" },
-      { enforce: "pre", test: /\.js$/, loader: "source-map-loader" }
+      { enforce: "pre", test: /\.js$/, loader: "source-map-loader" },
+      {
+        test: /\.css$/,
+        loaders: ['style-loader', 'css-loader']
+      }
     ]
   },