diff --git a/mu-plugins/blocks/sidebar-container/postcss/style.pcss b/mu-plugins/blocks/sidebar-container/postcss/style.pcss
index eb0a72ef0..cb5ecf41e 100644
--- a/mu-plugins/blocks/sidebar-container/postcss/style.pcss
+++ b/mu-plugins/blocks/sidebar-container/postcss/style.pcss
@@ -41,7 +41,7 @@
 			}
 		}
 
-		& > .wp-block-group:has(.wp-block-wporg-table-of-contents) + .is-link-to-top {
+		.wp-block-wporg-table-of-contents + .is-link-to-top {
 			border-top: 1px solid var(--wp--preset--color--light-grey-1);
 			padding-top: var(--wp--preset--spacing--20);
 		}