diff --git a/src/wp-includes/css/classic-themes.css b/src/wp-includes/css/classic-themes.css
index d77a25a3b9..4d54a1891e 100644
--- a/src/wp-includes/css/classic-themes.css
+++ b/src/wp-includes/css/classic-themes.css
@@ -16,3 +16,9 @@
 
 	font-size: 1.125em;
 }
+
+.wp-block-file__button {
+	background: #32373c;
+	color: #ffffff;
+	text-decoration: none;
+}