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src/main.tsx

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+import ReactDOM from "react-dom/client";
+import { createBrowserRouter, RouterProvider } from "react-router-dom";
+import Header from "./components/header/Header";
+import Main from "./pages/Main";
+import "./index.css";
+
+const router = createBrowserRouter([
+  {
+    path: "/",
+    element: <Header />,
+    children: [
+      {
+        path: "/",
+        element: <Main />,
+      },
+    ],
+  },
+]);
+
+ReactDOM.createRoot(document.getElementById("root")!).render(
+  <RouterProvider router={router} />
+);