Number pane not being highlighted in vim dracula theme

I am using dracula theme for vim and am not able to get the number pane, that is, the side panel which contains the line numbers, to be displayed in a sort of translucent manner. The preview image shows that it's possible.

How the terminal should look like

_{(source: draculatheme.com)}

How it actually looks

To fix this issue, I think I need to configure some attributes accordingly, but being a beginner, I don't know which ones, therefore any help and guidance would be appreciated.

As a reference, these are my dotvim files.

The background of the line numbers column is set in the colorscheme to NONE for color terminals and #282a36 for GUIs:

hi LineNr ctermfg=60 ctermbg=NONE cterm=NONE guifg=#6272a4 guibg=#282a36 gui=NONE

From there you have three options:

• Enable the 'termguicolors' option so that Vim uses the gui* attributes instead of the cterm* attributes.

  This is how the screenshot was taken but it will only work in select terminal emulators.

  See :help 'termguicolors'.

• Edit the colorscheme directly:

  hi LineNr ctermfg=60 ctermbg=242 cterm=NONE guifg=#6272a4 guibg=#282a36 gui=NONE
  

  I've chosen 242 arbitrarily but you can choose whatever color you want in this chart

• Override your colorscheme in your vimrc:

  function! MyHighlights() abort
      hi LineNr ctermfg=60 ctermbg=242 cterm=NONE guifg=#6272a4 guibg=#282a36 gui=NONE
  endfunction
  
  augroup MyColors
      autocmd!
      autocmd ColorScheme * call MyHighlights()
  augroup END
  colorscheme dracula