documentclass{article}
usepackage[showframe]{geometry}
usepackage{xltabular}
usepackage{makecell}
setcellgapes{6pt}

begin{document}

{makegapedcells
begin{xltabular}{linewidth}{ |*{4}{X|}}
hline
&Written by&Checked by&Approved by \
hline
endfirsthead
hline
&Written by&Checked by&Approved by \
hline
endhead
Department&Sales&& \
hline
Name&ABCD&& \
hline
Signature&&&\hline
Date&21-01-2009&17-06-2019&17-06-2019 \
hline
end{xltabular}}

end{document}