rowcolor too large when removing space on rows

Question

I am a LaTeX beginner and facing an issue that  I can't seem to find the answer for... I am creating a table (using booktabs but my issue also occurs when not using the package), and whenever I remove the space on the edges of the table (with @{}) and try to colour individual rows at the same time, the space taken by the colour is wider than the table. See the following example:
usepackage{array}
usepackage{colortbl}
usepackage[table,xcdraw]{xcolor}
% [...]

fbox{begin{tabular}{@{}ll@{}}
foo & bar
rowcolor[HTML]{BFBFBF} bar & foo
end{tabular}}

Which results in the following:

Thanks in advance for any help/pointer!

leandriis · Answer

You could use NiceTabular from the nicematrix package instead:

documentclass{article}
usepackage[table,xcdraw]{xcolor}

definecolor{mygray}{HTML}{BFBFBF}

usepackage{nicematrix}
begin{document}

fbox{begin{NiceTabular}{@{}ll@{}}[code-before=rowcolor{mygray}{2}]
foo & bar
 bar & foo
end{NiceTabular}}

end{document}

Bernard · Answer

I suggest setting fboxsep to $0$ instead, and keeping the spaces at both ends of the table, loading cellspace for the vertical spacing at the top and bottom of the table:
documentclass{article}
usepackage{array}
usepackage[table,xcdraw]{xcolor}
usepackage{cellspace}
setlength{cellspacetoplimit}{4pt}
setlength{cellspacebottomlimit}{4pt}
% [...]
begin{document}

{setlength{fboxsep}{0pt}
fbox{%
begin{tabular}{Sll}
foo & bar
rowcolor[HTML]{BFBFBF} bar & foo
end{tabular}}
}
end{document}

rowcolor too large when removing space on rows

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