\node (CN) [client,inner sep=0pt,draw,right=of CD] {Client\textsubscript{n}};
% line between server and browser
- \draw [dotted] ([xshift=-7em,yshift=-.8em]C1.south west) node[left,above]{browser} node[left,below]{server(s)} -- ([xshift=5em,yshift=-.8em]CN.south east);
+ \draw [dotted] ([xshift=-5em,yshift=-.8em]C1.south west) node[left,above]{browser} node[left,below]{server(s)} -- ([xshift=5em,yshift=-.8em]CN.south east);
\node[task,inner sep=-4.5pt,below=of C1,fill=white,xshift=6.5em,yshift=-4.5em] (Tn) {Task\textsubscript{n}};
\node[task,inner sep=-4.5pt,below=of C1,fill=white,xshift=5em,yshift=-3.0em] (Td) {\ldots};
\node[fit={(T1)(Sn)},draw] (TS) {};
% line between client and server
- \draw [dotted] ([xshift=-7em,yshift=-11em]C1.south west) node[left,above]{server(s)} node[left,below]{device(s)} -- ([xshift=5em,yshift=-11em]CN.south east);
+ \draw [dotted] ([xshift=-5em,yshift=-11em]C1.south west) node[left,above]{server(s)} node[left,below]{device(s)} -- ([xshift=5em,yshift=-11em]CN.south east);
% device 1
\node[task,text width=1.5em,inner sep=-4.5pt,node distance=12em,below=of C1,double copy shadow={shadow xshift=.4em,shadow yshift=-.4em},fill=white] (D1T1) {};