diff --git a/src/ScrollableContainers/_tk.py b/src/ScrollableContainers/_tk.py
index 4125cbf..b0e4ab7 100644
--- a/src/ScrollableContainers/_tk.py
+++ b/src/ScrollableContainers/_tk.py
@@ -65,7 +65,7 @@ def _hide_scrollbars(self):
         self._xscrollbar.lower()
         self._yscrollbar.lower()
 
-    def _peek_scrollbars(self, ms:int=1000):
+    def _peek_scrollbars(self, ms: int = 1000):
         """
         Show the horizontal and vertical scrollbars. Hide them after a delay.