diff --git a/assets/js/base/components/notice-banner/style.scss b/assets/js/base/components/notice-banner/style.scss
index 792bd5d6c60..6f80588b349 100644
--- a/assets/js/base/components/notice-banner/style.scss
+++ b/assets/js/base/components/notice-banner/style.scss
@@ -46,7 +46,7 @@
 		.wc-forward {
 			float: right;
 			color: $gray-800 !important;
-			background: transparent;
+			background: transparent !important; // For transparent notice button in Twenty Twenty-One theme.
 			padding: 0 !important;
 			margin: 0;
 			border: 0;