Stopped blue background flickering

Author: Francois Liot

assets/less/site/globals/site.variables

@@ -1,2 +1,3 @@
 /* Header */
-@navbarBackgroundImage: url(../../../../static/images/batteries.png);
+@navbarBackgroundImage: url(../../../../static/images/batteries.png);
+@navbarBackgroundColor: #195c61;