diff --git a/source/Ox.UI/css/theme.css b/source/Ox.UI/css/theme.css
index 2a898281..6811b1de 100644
--- a/source/Ox.UI/css/theme.css
+++ b/source/Ox.UI/css/theme.css
@@ -327,7 +327,7 @@ Forms
 }
 .$themeClass .OxButton.OxSymbol.OxDisabled {
     background-color: transparent;
-    opacity: 0.5;
+    background-image: none;
 }