diff --git a/src/wp-admin/css/site-icon.css b/src/wp-admin/css/site-icon.css
index 93f36f093caf9..6f9a6905c1092 100644
--- a/src/wp-admin/css/site-icon.css
+++ b/src/wp-admin/css/site-icon.css
@@ -97,7 +97,7 @@
 .site-icon-preview .app-icon-preview {
 	aspect-ratio: 1/1;
 	border-radius: 10px;
-	box-shadow: 0 1px 5px 0 var(--site-icon-shadow-3);
+	filter: drop-shadow(0 1px 5px var(--site-icon-shadow-3));
 	flex-shrink: 0;
 	width: 100%;
 	z-index: 1;
diff --git a/src/wp-includes/css/admin-bar.css b/src/wp-includes/css/admin-bar.css
index 77e196525657a..e8909d54f1a48 100644
--- a/src/wp-includes/css/admin-bar.css
+++ b/src/wp-includes/css/admin-bar.css
@@ -601,7 +601,6 @@ html:lang(he-il) .rtl #wpadminbar * {
 #wpadminbar #wp-admin-bar-site-name > .ab-item .site-icon {
 	width: 20px;
 	height: 20px;
-	background: #f0f0f1; /* matching my-account (user avatar) node's background */
 	border-radius: 2px;
 }