diff --git a/backend/server/main.py b/backend/server/main.py
index 5fbf403..f6eb952 100644
--- a/backend/server/main.py
+++ b/backend/server/main.py
@@ -32,9 +32,12 @@
     ],
 )
 
+
 class EnsureUserIDMiddleware(BaseHTTPMiddleware):
-    async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -> Response:
-        user_id = request.cookies.get('user_id')
+    async def dispatch(
+        self, request: Request, call_next: RequestResponseEndpoint
+    ) -> Response:
+        user_id = request.cookies.get("user_id")
         if not user_id:
             user_id = str(uuid.uuid4())  # Generate a new user_id
             request.state.user_id = user_id  # Set user_id in request state
@@ -45,6 +48,7 @@ async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -
             response = await call_next(request)
         return response
 
+
 app.add_middleware(EnsureUserIDMiddleware)
 
 ROOT = Path(__file__).parent.parent