Have an unpublished version of your website for admins

is it possible to have an unpublished version of your website that is only visible for the admins, and when they want to, they publish it? For example, I make a design change but I'm not sure if it is gonna work well, so I make it only visible for myself (and the admins), and when I made sure that the design has no bugs I publish it with one click instead of copy-pasting the codes.