diff --git a/packages/edit-post/src/components/layout/index.js b/packages/edit-post/src/components/layout/index.js
index 075c228eb3e84e..ccdd7f3dc3af4d 100644
--- a/packages/edit-post/src/components/layout/index.js
+++ b/packages/edit-post/src/components/layout/index.js
@@ -60,7 +60,7 @@ function Layout( {
} ) {
const sidebarIsOpened = editorSidebarOpened || pluginSidebarOpened || publishSidebarOpened;
- const className = classnames( 'edit-post-layout', {
+ const className = classnames( 'edit-post-layout', 'is-mode-' + mode, {
'is-sidebar-opened': sidebarIsOpened,
'has-fixed-toolbar': hasFixedToolbar,
'has-metaboxes': hasActiveMetaboxes,
@@ -81,7 +81,7 @@ function Layout( {