--- a/Zukitwo/gtk-3.0/gtk-widgets.css	2014-10-22 09:04:18.000000000 +0100
+++ b/Zukitwo/gtk-3.0/gtk-widgets.css	2015-04-01 13:52:00.725895000 +0100
@@ -134,7 +134,8 @@ GtkTextView {
 /************
  * Tooltips *
  ************/
-.tooltip {
+.tooltip,
+.tooltip.background {
 	padding: 4px;
 	border-style: solid;
 	border-width: 1px;