diff --git a/src/pyj/read_book/view.pyj b/src/pyj/read_book/view.pyj
index b15f1b49a2..30656f55a0 100644
--- a/src/pyj/read_book/view.pyj
+++ b/src/pyj/read_book/view.pyj
@@ -185,7 +185,7 @@ class View:
                 s = document.getElementById('book-{}-margin'.format(which)).style
                 if which is 'top' or which is 'bottom':
                     s.color = ans.foreground  # Setting a color for the side margins causes the hover arrow to become visible
-                    s.backgroundColor = ans.background
+                s.backgroundColor = ans.background
         return ans
 
     def on_resize(self):