diff --git a/monitorix.cgi b/monitorix.cgi
index ad5cfcd..b2c68af 100755
--- a/monitorix.cgi
+++ b/monitorix.cgi
@@ -253,6 +253,7 @@ if(!$config{theme}->{$color}) {
 	$config{theme}->{$color}->{title_bg} = "777777";
 	$config{theme}->{$color}->{title_fg} = "CCCC00";
 	$config{theme}->{$color}->{graph_bg} = "CCCCCC";
+	$config{theme}->{$color}->{gap} = "FFFFFF";
 }
 
 if($color eq "black") {
@@ -273,6 +274,7 @@ $colors{fg_color} = $config{theme}->{$color}->{main_fg};
 $colors{title_bg_color} = $config{theme}->{$color}->{title_bg};
 $colors{title_fg_color} = $config{theme}->{$color}->{title_fg};
 $colors{graph_bg_color} = $config{theme}->{$color}->{graph_bg};
+$colors{gap} = $config{theme}->{$color}->{gap};
 
 
 ($tf{twhen}) = ($when =~ m/(hour|day|week|month|year)$/);
diff --git a/monitorix.conf b/monitorix.conf
index 9f6f10d..3714944 100644
--- a/monitorix.conf
+++ b/monitorix.conf
@@ -522,6 +522,7 @@ logo_bottom = logo_bot.png
 		title_bg	= 777777
 		title_fg	= CCCC00
 		graph_bg	= CCCCCC
+		gap		= FFFFFF
 	</white>
 	<black>
 		canvas		= 000000
@@ -539,6 +540,7 @@ logo_bottom = logo_bot.png
 		title_bg	= 333333
 		title_fg	= 888800
 		graph_bg	= 888888
+		gap		= FFFFFF
 	</black>
 </theme>