params in url + error boundary

src/app.tsx

@@ -1,13 +1,16 @@
 import React from 'react';
 import { BrowserRouter, HashRouter } from 'react-router-dom';
+import { ThemeProvider } from '@emotion/react'
 
 import { Dashboard } from './dashboard';
 
 const App = () => {
   return (
-    <BrowserRouter>
-      <Dashboard />
-    </BrowserRouter>
+    <ThemeProvider theme={{ colors: { main: 'green' } }}>
+      <BrowserRouter>
+        <Dashboard />
+      </BrowserRouter>
+    </ThemeProvider>
   );
 };