diff --git a/theme/site/globals/site.variables b/theme/site/globals/site.variables
index c6d723a6..86da85a3 100644
--- a/theme/site/globals/site.variables
+++ b/theme/site/globals/site.variables
@@ -197,4 +197,10 @@
 
 @serialBackgroundColor: #fff;
 @serialGraphBackground: #F2F2F2;
-@serialConsoleBackground: @serialGraphBackground;
\ No newline at end of file
+@serialConsoleBackground: @serialGraphBackground;
+
+/*-------------------
+   Extensions
+--------------------*/
+
+@extensionsHeaderBackground: #999;
\ No newline at end of file