Load and output sass

frontend/package.json

@@ -7,15 +7,18 @@
     "test": "echo \"Error: no test specified\" && exit 1",
     "watch": "webpack --watch",
     "start": "webpack serve --open",
-    "server": "node server.js",
-    "build": "webpack"
+    "build": "webpack --env production"
   },
   "keywords": [],
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "express": "^4.17.1",
+    "css-loader": "^5.2.0",
     "html-webpack-plugin": "^5.3.1",
+    "mini-css-extract-plugin": "^1.5.1",
+    "sass": "^1.32.12",
+    "sass-loader": "^11.0.1",
+    "style-loader": "^2.0.0",
     "webpack": "^5.31.0",
     "webpack-cli": "^4.6.0",
     "webpack-dev-middleware": "^4.1.0",