How to create a border between line numbers and text in Vim

Question

I want to have a thin border line to the right of line numbers and to the left of text.

Answer 1

I do not think that's possible.

However, you can make the gutter wider.

:set numberwidth=3 

Answer 2

You can use a different color to highlight LineNr . For instance:

 :hi LineNr cterm=bold ctermbg=gray ctermfg=black gui=bold guibg=gray guifg=white