diff --git a/packages/edit-site/src/components/style-book/constants.ts b/packages/edit-site/src/components/style-book/constants.ts
index 401d532b98cbb..ea99279fd9e65 100644
--- a/packages/edit-site/src/components/style-book/constants.ts
+++ b/packages/edit-site/src/components/style-book/constants.ts
@@ -239,7 +239,6 @@ export const STYLE_BOOK_IFRAME_STYLES = `
 	.edit-site-style-book__subcategory-title {
 		font-size: 16px;
 		margin-bottom: 40px;
-    	border-bottom: 1px solid #ddd;
     	padding-bottom: 8px;
 	}