Mein LaTeX-Forum

\documentclass{minimal}
\usepackage[a4paper,margin=1cm,landscape]{geometry}
\usepackage{tikz}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{comment}
:Title:  Class diagram

\end{comment}
\usetikzlibrary{positioning,shapes,shadows,arrows}

\begin{document}
   \tikzstyle{abstract}=[rectangle, draw=black, rounded corners, fill=blue!40, drop shadow,
   text centered, anchor=north, text=white, text width=3cm]
   \tikzstyle{comment}=[rectangle, draw=black, rounded corners, fill=green, drop shadow,
   text centered, anchor=north, text=white, text width=3cm]
   \tikzstyle{myarrow}=[->, >=open triangle 90, thick]
   \tikzstyle{line}=[-, thick]
   
   \begin{center}
      \begin{tikzpicture}[node distance=2cm]
      \node (Client) [abstract]
      {\textbf{Client}      
      };
      %%%%%%%%%%%%%% linke seite %%%%%%%%%%%%%%%%%%%
     
      \node (lmgrd) [text width=4cm, below=of Client] {};
      \node (lmgrd) [abstract, left=of lmgrd]
      {
         \textbf{lmgrd}
         
      };
   %%%%%%%%%%%%%% rechte seite %%%%%%%%%%%%%%%%%%%
      \node (ugslmd) [text width=4cm, below=of Client] {};
      \node (ugslmd) [abstract, right=of ugslmd]
      {
         \textbf{ugslmd}
         
      };
     
      %%%%%%%%%%%%%%%%% mitte darunter %%%%%%%%%%%%%%%
     
      \node (licfile) [text width=4cm, right=of lmgrd ] {};
      \node (licfile) [abstract, below=of lmgrd]
      {
         \textbf{licfile}
         
      };
     
         
      \end{tikzpicture}
   \end{center}
\end{document}
 

\documentclass[tikz, border=5pt]{standalone}
\usetikzlibrary{positioning,shadows}

\begin{document}
   \tikzstyle{abstract}=[draw, rounded corners, fill=blue!40, drop shadow,
   text centered, anchor=north, text=white, text width=3cm, font=\bfseries]% <- erweitert
   \tikzstyle{comment}=[draw, rounded corners, fill=green, drop shadow,
   text centered, anchor=north, text=white, text width=3cm]
   \tikzstyle{myarrow}=[->, >=open triangle 90, thick]
   \tikzstyle{line}=[-, thick]
   
      \begin{tikzpicture}[node distance=2cm, nodes=abstract]
      \node (Client) {Client};
      %%%%%%%%%%%%%% linke seite %%%%%%%%%%%%%%%%%%%
     
      \node (lmgrd) [below left=of Client]{lmgrd};
      %%%%%%%%%%%%%% rechte seite %%%%%%%%%%%%%%%%%%%
      \node (ugslmd) [below right=of Client]{ugslmd};
     
      %%%%%%%%%%%%%%%%% mitte darunter %%%%%%%%%%%%%%%
     
      \node (licfile) [below right=of lmgrd]{licfile};
      \end{tikzpicture}
\end{document}