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%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%%Run also: >>  << 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
%
\newsavebox\MBox
\newlength\MBoxht
\newcommand\FBox[2][Beispiel]{%
  \sbox\MBox{#2}%
  \setlength\MBoxht{\ht\MBox}%
  \setlength\fboxsep{6pt}%
  \addtolength\MBoxht{\fboxsep}%
  \addtolength\MBoxht{\baselineskip}%
  \fcolorbox{blue}{yellow!50}{\usebox\MBox}%
  \hspace*{-\wd\MBox}%
  \raisebox{1.5\ht\MBox}{%
    \makebox[\wd\MBox]{%
      \fboxsep=3pt\colorbox{blue}{\color{white}#1}}}}

\usepackage{amsmath,empheq,xcolor}% \FBox->Praeambel

\begin{document}
\begin{empheq}[{box=\FBox[Ein Beispiel]}]{alignat=3}
  abc &= xxx             &&= xxxxxxxxxxxx &&= aaaaaaaaa \\
  ab  &= yyyyyyyyyyyyyyy &&= yyyy         &&= ab
\end{empheq}
\end{document}