Cardview rounded corner fixed for all devices

I am trying to use card views as a rounded button.
It is good on my 2 phones but when I exported the apk and installed it in nox, the rounded corner was not as I intended it to be.

Are there any tutorials so that my border radius for corners are the same all throughout any devices?
does someone have a starting template that I can use as guide to have fixed UI?

If I got this fixed, I will continue on making my free koded UI! :smiley:

Thank you!

use kevin enhance extension and set redius