%%% outline
%-------------------------------------------------------------------------
\begin{tikzpicture}



\begin{scope}[scale=1.0]
{
\node [anchor=north west,minimum width=5em, minimum height=2.2em,fill=blue!70](num1)  at (0,0) {\quad \ A};

\node [anchor=north west,minimum width=2em, minimum height=2.2em,fill=green!70](num2)  at ([xshift=3.8em,yshift=2.23em]num1.south west) {B};


\node [anchor=north west,minimum width=3.8em, minimum height=2.2em,fill=yellow!70](part1)  at ([xshift=5.8em,yshift=2.23em]num1.south west) {C\quad \ };


\draw [-,very thick,black] (num1.north west)--(num2.north west)--(num2.south west)--(num1.south west)--([yshift=0.05em]num1.north west);
\draw [-,very thick,black] (num2.north west)--(num2.north east)--(num2.south east)--(num2.south west)--(num2.north west);
\draw [-,very thick,black] (num2.north east)--(part1.north east)--(part1.south east)--(num2.south east);

}
\end{scope}
\end{tikzpicture}
%---------------------------------------------------------------------