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\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}