diff --git a/demo-invenioils/ui/src/overridableMapping.js b/demo-invenioils/ui/src/overridableMapping.js
index 0f2b240..f88474d 100644
--- a/demo-invenioils/ui/src/overridableMapping.js
+++ b/demo-invenioils/ui/src/overridableMapping.js
@@ -4,6 +4,7 @@ import {
 } from './overridden/components/Menu';
 import { LoginDocs } from './overridden/authentication/Login';
 import { FeaturesRoute } from './overridden/routes/FrontsiteUrls';
+import { CustomBanner } from './overridden/CustomBanner';
 
 export const overriddenCmps = {
   'SectionsWrapper.servicesInstallationSections': () => null,
@@ -11,4 +12,7 @@ export const overriddenCmps = {
   'ILSMenu.RightMenuItemsMobile': RightMenuItemMobile,
   'Login.layout.extras': LoginDocs,
   'FrontSite.CustomRoute': FeaturesRoute,
+  'Login.extras': CustomBanner,
+  'BackOffice.extras': CustomBanner,
+  'FrontSite.extras': CustomBanner,
 };
diff --git a/demo-invenioils/ui/src/overridden/CustomBanner.js b/demo-invenioils/ui/src/overridden/CustomBanner.js
new file mode 100644
index 0000000..0e1d54e
--- /dev/null
+++ b/demo-invenioils/ui/src/overridden/CustomBanner.js
@@ -0,0 +1,15 @@
+import React from 'react';
+import { Message } from 'semantic-ui-react';
+
+export const CustomBanner = () => {
+  return (
+    <Message className="center no-margin warning">
+      <div
+        dangerouslySetInnerHTML={{
+          __html:
+            '<i class="exclamation triangle icon"></i> This is the Invenio ILS <b>demo instance</b>: data might be periodically deleted and recreated.',
+        }}
+      />
+    </Message>
+  );
+};