diff --git a/packages/edit-site/src/components/global-styles/screen-root.js b/packages/edit-site/src/components/global-styles/screen-root.js
index ce9e4d08daf0a..e15eae1cd3096 100644
--- a/packages/edit-site/src/components/global-styles/screen-root.js
+++ b/packages/edit-site/src/components/global-styles/screen-root.js
@@ -55,6 +55,7 @@ function ScreenRoot() {
 	return (
 		<Card
 			size="small"
+			isBorderless
 			className="edit-site-global-styles-screen-root"
 			isRounded={ false }
 		>
diff --git a/packages/edit-site/src/components/global-styles/style.scss b/packages/edit-site/src/components/global-styles/style.scss
index 99b1c8c92bbd0..dae6a9df73afe 100644
--- a/packages/edit-site/src/components/global-styles/style.scss
+++ b/packages/edit-site/src/components/global-styles/style.scss
@@ -228,9 +228,14 @@
 	}
 }
 
+.edit-site-global-styles-sidebar__navigator-provider {
+	height: 100%;
+}
+
 .edit-site-global-styles-sidebar__navigator-screen {
 	display: flex;
 	flex-direction: column;
+	height: 100%;
 }
 
 .edit-site-global-styles-sidebar__navigator-screen .single-column {