Fix custom styles example (#79)

Author: rkulinski

examples/react/custom-styles/package.json

@@ -10,7 +10,8 @@
   "dependencies": {
     "@tanstack/react-ranger": "0.0.4",
     "react": "^18.2.0",
-    "react-dom": "^18.2.0"
+    "react-dom": "^18.2.0",
+    "styled-components": "^5.3.6"
   },
   "devDependencies": {
     "@types/react": "^18.0.26",