diff --git a/core/src/toga/style/applicator.py b/core/src/toga/style/applicator.py
index 33e733c15b..4f9a7552db 100644
--- a/core/src/toga/style/applicator.py
+++ b/core/src/toga/style/applicator.py
@@ -31,10 +31,10 @@ def set_hidden(self, hidden):
             # grandchildren.
             #
             # parent hidden child hidden style child final hidden state
-            # ============= ================== ======================== 
+            # ============= ================== ========================
             # True          True               True
             # True          False              True
-            # False         True               True 
+            # False         True               True
             # False         False              False
             child.applicator.set_hidden(hidden or child.style._hidden)