add router and try some fixes on the KepzettsegSelector.tsx

src/App.tsx

@@ -1,12 +1,20 @@
 import React from 'react';
 import './App.css';
 import CreateCharacter from "./pages/CreateCharacter";
+import { createBrowserRouter, RouterProvider } from "react-router-dom";
+
+const router = createBrowserRouter([
+    {
+        path: "/",
+        element: <CreateCharacter />,
+    },
+]);
 
 function App() {
   return (
-    <div className="container">
-        <CreateCharacter />
-    </div>
+      <div className='container'>
+        <RouterProvider router={router} />
+      </div>
   );
 }