%tikz
\begin{tikzpicture}[every node/.style={draw,scale=1pt,minimum width=15pt,inner sep=3pt,line width=1pt,draw=black!20}]
\matrix[row sep=2pt,column sep=2pt]
{\node[fill=black!80]{1};&
\node[fill=black!70]{2};&
\node[fill=black!60]{3};&
\node[fill=black!50]{4};&
\node[fill=black!40]{5};\\
};
\end{tikzpicture}