Erste Zeile zentriert in Matrix

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\documentclass[margin=5mm]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{matrix,positioning}
\tikzset{
  tab/.style={inner sep=0pt,
    nodes={inner sep=.333em,
      % notwendig für leere Zellen und Unterlängen:
      minimum height={\baselineskip+0.666em}
    }
  },
  vtab/.style={matrix of nodes,tab,
    row sep=-\pgflinewidth,column sep=-\pgflinewidth,
    nodes in empty cells,% leere Zellen werden ebenfalls gezeichnet
    nodes={draw,align=left,text width=#1}
  },
  vtab/.default=3cm,% voreingestellte Breite
  htab/.style={matrix of nodes,draw,tab,anchor=north west},
  every edge/.append style={font=\footnotesize\strut,inner ysep=.1em},
  pfeil/.style={out=270,in=90,->}
}
\begin{document}
\resizebox{!}{\textwidth}{%
\begin{itshape}
\begin{tikzpicture}[thick,
  % vertikaler und horizontaler Abstand zwischen den Tabellen:
  node distance=1cm and 3.4cm, % row 1/.style={},
]
%Tabelle
\matrix(M)[vtab]{Mitarbeiter\\{Login<<pk>>\newline Nachname\newline Vorname}\\\\};
\matrix(S)[right= of M,vtab]{Stelle\\{Nummer<<pk>>}\\\\};
\end{tikzpicture}
\end{itshape}
}
\end{document}
 
 
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