[gnome-mines/arnaudb/wip/gtk4: 28/36] Update -gtk-icon-effect CSS property.

[Arnaud B. <arnaudb src gnome org>]

commit 3201549228fca58e01948bdc94b75a0ed1e10914
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Apr 15 13:14:48 2020 +0200

    Update -gtk-icon-effect CSS property.

 src/gnome-mines.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gnome-mines.css b/src/gnome-mines.css
index 3456a00..50a145c 100644
--- a/src/gnome-mines.css
+++ b/src/gnome-mines.css
@@ -10,7 +10,7 @@
 }
 
 .count, .explodedField .tile {
--gtk-icon-effect: none;
+  -gtk-icon-filter: none;
 }
 
 .navigation {