\tikzset{
	table/.style={
		matrix of nodes,
		row sep=-\pgflinewidth,
		column sep=-\pgflinewidth,
		nodes={
			rectangle,
			draw=black,
			align=center
		},
		minimum height=4em,
		text depth=0.5ex,
		text height=1ex,
		nodes in empty cells,
		anchor=center,
		%%
		every even row/.style={
			nodes={fill=gray!20}
		},
		column 1/.style={
			nodes={text width=2em,font=\bfseries}
		},
		column 2/.style={
			nodes={minimum width=2.5em, text width=2.5em}
		},
		column 3/.style={
			nodes={minimum width=2.5em, text width=2.5em}
		},
		row 1/.style={
			nodes={
				fill=blue!20,
				text= black,
				font=\bfseries,
				minimum height=5em
			}
		}
	}
}