diff --git a/app.py b/app.py
index 59190ad..8bdeac6 100644
--- a/app.py
+++ b/app.py
@@ -1256,7 +1256,7 @@ def favicon():
 @app.route("/")
 def main_page():
     now = datetime.now(timezone.utc)
-    month_str = request.args.get("month")
+    month_str = request.args.get("month") or now.strftime("%Y-%m")
     start = end = None
 
     if month_str: