(the sticky navbar on the desktop in all browsers is not working. It is working only in development console mode using chrome. However, working in mobile device.)
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Sticky navbars are handled by CSS, which runs completely in the browser. Hosting should not affect this, given that CSS is basically just text that’s downloaded.
I did give it a quick look though, and I see you’ve added your own CSS to handle the sticky navbar. Seeing how you’re using Bootstrap, I would recommend to try using the Bootstrap method of creating a sticky navbar instead, as framework classes tend to be more “complete”, and play nicer together, than custom CSS.