diff --git a/docs/frontend-system/building-apps/01-index.md b/docs/frontend-system/building-apps/01-index.md
index d11b6efba2..ef79d36c4a 100644
--- a/docs/frontend-system/building-apps/01-index.md
+++ b/docs/frontend-system/building-apps/01-index.md
@@ -35,6 +35,7 @@ This is how to create a minimal app:
 import ReactDOM from 'react-dom/client';
 import { createApp } from '@backstage/frontend-defaults';
 import catalogPlugin from '@backstage/plugin-catalog/alpha';
+import '@backstage/ui/css/styles.css';
 
 // Create your app instance
 const app = createApp({