When logged in to app swiches to navbar erpnext navbar

I have created web template for navbar so that It should be same for every page. But while it comes to the core page css doesn’t applied and it swiches to erpnext navbar

if you want to apply your custom CSS over core CSS then you need to create the same file with the same name in your Custom app in the www folder.
this will override you custom HTML or CSS over core HTML or CSS


okay but what if we have created web pages in erpnext by following way

Did you manage to change the navbar in the desk page?