add frontend to allow-origins

main.py

@@ -48,7 +48,7 @@ temp_files = {}
 middleware = [
     Middleware(
         CORSMiddleware,
-        allow_origins=['http://localhost:8100'],
+        allow_origins=['http://localhost:8100', 'https://text2quiz-three.vercel.app'],
         allow_methods =['*'],
     ),
 ]