Remove legacy CSS

package.json

@@ -30,6 +30,9 @@
   ],
   "author": "Andras Schmelczer",
   "license": "Unlicense",
+  "browserslist": [
+    "supports webgpu and last 2 years"
+  ],
   "dependencies": {
     "gl-matrix": "^3.4.4"
   },
@@ -39,11 +42,13 @@
     "@types/node": "^25.6.0",
     "@vite-pwa/assets-generator": "^1.0.2",
     "@webgpu/types": "^0.1.69",
+    "browserslist": "^4.28.2",
     "eslint": "^10.3.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-prettier": "^5.5.5",
     "eslint-plugin-unused-imports": "^4.4.1",
     "globals": "^17.6.0",
+    "lightningcss": "^1.32.0",
     "npm-check-updates": "^22.1.0",
     "prettier": "^3.8.3",
     "sass": "^1.99.0",