diff --git a/wp-includes/css/buttons.css b/wp-includes/css/buttons.css
index cb4ff97504..3e94661ea4 100644
--- a/wp-includes/css/buttons.css
+++ b/wp-includes/css/buttons.css
@@ -93,6 +93,10 @@ input[type="submit"]::-moz-focus-inner {
 	outline: none;
 }
 
+.button.hidden {
+	display: none;
+}
+
 /* ----------------------------------------------------------------------------
   2.0 - Default Button Style
 ---------------------------------------------------------------------------- */