diff --git a/src/calibre/gui2/tweak_book/editor/themes.py b/src/calibre/gui2/tweak_book/editor/themes.py
index 929a94a456..93aac36849 100644
--- a/src/calibre/gui2/tweak_book/editor/themes.py
+++ b/src/calibre/gui2/tweak_book/editor/themes.py
@@ -137,7 +137,7 @@ THEMES = {
     SpecialCharacter bg={cursor_loc}
     Error        us=wave uc=red
 
-    DiffDelete   bg=rgb(255,160,180) fg=rgb(200,60,90)
+    DiffDelete   bg=rgb(255,180,200) fg=rgb(200,80,110)
     DiffInsert   bg=rgb(180,255,180) fg=rgb(80,210,80)
     DiffReplace  bg=rgb(206,226,250) fg=rgb(90,130,180)
     DiffReplaceReplace bg=rgb(180,210,250)