Custom Navbar at bottom of the screen

Hey there!
I’m making a web application that asks for a custom navbar for better user experience.
I managed to create a navbar that satisfies my needs, but I’m stuck with the part where I stick the navbar to the absolute bottom of the screen.

Is there any way to do that?
I explored padding otpions, but soon realised, it won’t work around multiple screen sizes

i’m looking to create a navbar and push it at the end of the screen. It should stay there and visible at all times