diff --git a/core/css/styles.css b/core/css/styles.css
index 481fb6d5f39caec48e7c66bc890353eb3cd1bd65..f0b5b448dddf98f3f9e36b6935894ce942063305 100644
--- a/core/css/styles.css
+++ b/core/css/styles.css
@@ -113,7 +113,7 @@ input:disabled, input:disabled:hover, input:disabled:focus,
 button:disabled, button:disabled:hover, button:disabled:focus,
 .button:disabled, .button:disabled:hover, .button:disabled:focus,
 a.disabled, a.disabled:hover, a.disabled:focus {
-	background: rgba(230,230,230,.9);
+	background-color: rgba(230,230,230,.9);
 	color: #999;
 	cursor: default;
 }