I have line numbering but want to have a background margin to set the numbers on

I would like to have line numbers displayed on a margin that has a
different colour to the rest of the document to make it stand out and
look nicer, how can I do that?
At the moment I can have a coloured colum (set foldcolumn=2)
OR line numbering but I cant seem to combine them so that the numbers
appear on top of the coloured column.

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