diff --git a/mu-plugins/blocks/table-of-contents/postcss/style.pcss b/mu-plugins/blocks/table-of-contents/postcss/style.pcss
index 6f5b42bdb..92e83bcc4 100644
--- a/mu-plugins/blocks/table-of-contents/postcss/style.pcss
+++ b/mu-plugins/blocks/table-of-contents/postcss/style.pcss
@@ -6,6 +6,7 @@
 
 	@media (max-width: 1199px) {
 		border: 1px solid var(--wp--preset--color--light-grey-1);
+		border-radius: 2px;
 		padding: 15px var(--wp--preset--spacing--20);
 	}
 }