diff --git a/rtdata/themes/TooWaBlue-Dark-GTK3-20_.css b/rtdata/themes/TooWaBlue-Dark-GTK3-20_.css
index 4c6bbc3ef..754aa61b7 100644
--- a/rtdata/themes/TooWaBlue-Dark-GTK3-20_.css
+++ b/rtdata/themes/TooWaBlue-Dark-GTK3-20_.css
@@ -2,7 +2,7 @@
   This file is part of RawTherapee.
 
   Copyright (c) 2016-2017 TooWaBoo
-  Version 2.45 - requires RT 5.0
+  Version 2.46 - requires RT 5.0
 
   RawTherapee is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -789,6 +789,11 @@ window.csd:not(.fullscreen) #MainNotebook > header.top {
     margin-bottom: 0.33334em;
 }
 
+#ToolPanelNotebook > header tab{
+    margin-left: 0.08333em;
+    margin-right: 0.08333em;
+}
+
 #ToolPanelNotebook > header tab image{
     min-height: 2.5em;
     min-width: calc(1.66667em + 6px);