include the primereact css-files

src/index.tsx

@@ -4,6 +4,9 @@ import './index.css';
 import App from './App';
 import reportWebVitals from './reportWebVitals';
 
+import 'primereact/resources/themes/lara-light-blue/theme.css';
+import 'primereact/resources/primereact.min.css';
+
 const root = ReactDOM.createRoot(
   document.getElementById('root') as HTMLElement
 );