diff --git a/tmux.conf b/tmux.conf
index a18706e..bcda2e9 100644
--- a/tmux.conf
+++ b/tmux.conf
@@ -281,10 +281,12 @@ set -g pane-active-border-style fg=white,bg=white
 set -g pane-border-style fg=white,bg=default
 
 # Dim inactive panes: only cells in "default" colour change (coloured text and
-# vim's own background stay as they are); the active pane keeps the terminal
-# background. Needs tmux >= 2.1.
-set -g window-style        fg=colour247,bg=colour234
-set -g window-active-style fg=default,bg=default
+# vim's own background stay as they are). The active style must repeat the
+# terminal colours: since tmux 3, "default" there inherits window-style, so
+# the active pane would be dimmed too. Values = iTerm2 Default profile, dark
+# mode (fg #dcdcdc, bg #15191f); a light theme needs the opposite.
+set -g window-style        fg=#a6acb6,bg=#353d48
+set -g window-active-style fg=#dcdcdc,bg=#15191f
 
 # set Message text
 set-option -g message-style bg=default,fg=red