Things are working now.

package-lock.json

@@ -11,11 +11,14 @@
         "@testing-library/jest-dom": "^5.17.0",
         "@testing-library/react": "^13.4.0",
         "@testing-library/user-event": "^13.5.0",
+        "autoprefixer": "^10.4.19",
         "firebase": "^10.12.2",
         "lucide-react": "^0.395.0",
+        "postcss": "^8.4.38",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
         "react-scripts": "5.0.1",
+        "tailwindcss": "^3.4.3",
         "web-vitals": "^2.1.4"
       }
     },