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

Question

I'd like to have a thin border line to the right of the line numbers and to the left of the text.

Answer 1

You might use different color to highlight LineNr. For example:

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

Answer 2

I don't think that's possible.

However, you can make the gutter wider.

:set numberwidth=3