diff --git a/packages/edit-site/src/components/header/index.js b/packages/edit-site/src/components/header/index.js
index fe9eb71ada311..3cb84b3b68e89 100644
--- a/packages/edit-site/src/components/header/index.js
+++ b/packages/edit-site/src/components/header/index.js
@@ -84,6 +84,7 @@ export default function Header( {
 				<Button
 					isPrimary
 					isPressed={ isInserterOpen }
+					className="edit-site-header-toolbar__inserter-toggle"
 					onClick={ onToggleInserter }
 					icon={ plus }
 					label={ _x(
diff --git a/packages/edit-site/src/components/header/style.scss b/packages/edit-site/src/components/header/style.scss
index 63953755afd2b..0e1f2f5fb8674 100644
--- a/packages/edit-site/src/components/header/style.scss
+++ b/packages/edit-site/src/components/header/style.scss
@@ -9,11 +9,16 @@
 .edit-site-header__toolbar {
 	display: flex;
 	flex-grow: 1;
-	padding-left: $grid-unit-10;
+	padding-left: $grid-unit-30;
 	align-items: center;
 
-	& > * {
+	.edit-site-header-toolbar__inserter-toggle {
 		margin-left: 5px;
+		margin-right: $grid-unit-10;
+		min-width: $grid-unit-40;
+		width: $grid-unit-40;
+		height: $grid-unit-40;
+		padding: 0;
 	}
 }