documentclass[twoside]{book}

usepackage{tikz}
%%table
usetikzlibrary{matrix}
tikzset{
    table/.style={
        matrix of nodes,
        row sep=-pgflinewidth,
        column sep=-pgflinewidth,
        nodes={
            rectangle,
            draw=gray!50,
            align=center
        },
        minimum height=1.5em,
        text depth=0.5ex,
        text height=2ex,
        nodes in empty cells,
%%
        every odd row/.style={
            nodes={fill=gray!05}
        },
        column 1/.style={
          nodes={text width=5em,font=bfseries}
        },
        row 1/.style={
            nodes={
                fill=gray!25,
                text=black,
                text height=2.5ex,
                font=bfseries, purple!75!black
            }
        }
    }
}

begin{document}

begin{tikzpicture}
matrix[table,text width=12em]
{
first & 2nd column   & 3rd column\
&A & B \
& C & D \
};
end{tikzpicture}

end{document}