diff --git a/core/modules/settings_tray/settings_tray.info.yml b/core/modules/settings_tray/settings_tray.info.yml
index bb2e36c4d9..c3adfd2d04 100644
--- a/core/modules/settings_tray/settings_tray.info.yml
+++ b/core/modules/settings_tray/settings_tray.info.yml
@@ -1,7 +1,7 @@
 name: 'Settings Tray'
 type: module
 description: 'Provides a sidebar to configure blocks on the page.'
-package: Core (Experimental)
+package: Core
 version: VERSION
 core: 8.x
 dependencies:
diff --git a/core/modules/settings_tray/css/settings_tray.module.css b/core/themes/stable/css/settings_tray/settings_tray.module.css
similarity index 100%
copy from core/modules/settings_tray/css/settings_tray.module.css
copy to core/themes/stable/css/settings_tray/settings_tray.module.css
diff --git a/core/modules/settings_tray/css/settings_tray.motion.css b/core/themes/stable/css/settings_tray/settings_tray.motion.css
similarity index 100%
copy from core/modules/settings_tray/css/settings_tray.motion.css
copy to core/themes/stable/css/settings_tray/settings_tray.motion.css
diff --git a/core/modules/settings_tray/css/settings_tray.theme.css b/core/themes/stable/css/settings_tray/settings_tray.theme.css
similarity index 100%
copy from core/modules/settings_tray/css/settings_tray.theme.css
copy to core/themes/stable/css/settings_tray/settings_tray.theme.css
diff --git a/core/modules/settings_tray/css/settings_tray.toolbar.css b/core/themes/stable/css/settings_tray/settings_tray.toolbar.css
similarity index 100%
copy from core/modules/settings_tray/css/settings_tray.toolbar.css
copy to core/themes/stable/css/settings_tray/settings_tray.toolbar.css
diff --git a/core/themes/stable/stable.info.yml b/core/themes/stable/stable.info.yml
index 957a65cf35..8844fbba0f 100644
--- a/core/themes/stable/stable.info.yml
+++ b/core/themes/stable/stable.info.yml
@@ -162,6 +162,15 @@ libraries-override:
         css/quickedit.theme.css: css/quickedit/quickedit.theme.css
         css/quickedit.icons.theme.css: css/quickedit/quickedit.icons.theme.css
 
+  settings_tray/drupal.settings_tray:
+    css:
+      component:
+        css/settings_tray.module.css: css/settings_tray/settings_tray.module.css
+        css/settings_tray.motion.css: css/settings_tray/settings_tray.motion.css
+        css/settings_tray.toolbar.css: css/settings_tray/settings_tray.toolbar.css
+      theme:
+        css/settings_tray.theme.css: css/settings_tray/settings_tray.theme.css
+
   shortcut/drupal.shortcut:
     css:
       theme: