I can not customise page.html of jupyterhub with kubernetes

I deployed jupyterhub with kubernetes on the cloud.
Looking for the customization, I was able to modify and customize the login page, login.html.
I tried to customize the page.html but whatever I do, it doesnt’ work. Everytime it loads the default page.html. I am not able to customize the notebooks.

Any help will be appreciated.
Thanks