Neovim: Easy 'zen' mode

Couple of Neovim commands (are these just classic vim commands? I don't know) for creating empty window splits on the left and right, which you can use to center the window/windows you're focusing on.

Useful to know if, like me, you use a zen mode plugin but sometimes want to center multiple windows. As far as I know zen mode plugins are just used for centering a single window. I frequently want two centered windows with empty space on either side.

topleft vnew | vertical resize 20

botright vnew | vertical resize 20

once the splits are created you can resize them however you normally would. With my current monitor a simple ctrl+w = (makes all windows equal width) works well, but you can tweak the commands or even drag with your mouse cursor to resize.