[gtk+] gtk-demo: Fix selection in css basics demo

[Timm Bäder <baedert src gnome org>]

commit 5fb10d25c150d068bea0fdfe708e1e525bf44d3c
Author: Timm Bäder <mail baedert org>
Date:   Sat Nov 21 21:04:02 2015 +0100

    gtk-demo: Fix selection in css basics demo

 demos/gtk-demo/css_basics.css |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/demos/gtk-demo/css_basics.css b/demos/gtk-demo/css_basics.css
index 62dba7a..0b3365f 100644
--- a/demos/gtk-demo/css_basics.css
+++ b/demos/gtk-demo/css_basics.css
@@ -16,7 +16,7 @@
 }
 
 /* Make sure selections are visible */
-:selected {
+selection {
   background-color: darkGreen;
   color: black;
 }