diff --git a/demos/gtk-demo/css_basics.css b/demos/gtk-demo/css_basics.css
index 62dba7a30a..0b3365f50f 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;
 }