%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%%  Beispiel 13-02-18 auf Seite 641.
%% 
%%  Copyright (C) 2015 Vo\ss 
%% 
%%  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.
%% 

% Show page(s) 2

%% ==== 
\PassOptionsToClass{}{beamer}
\documentclass{exabeamer}
\usepackage[utf8]{inputenc}

%StartShownPreambleCommands
\useoutertheme{sidebar}\usecolortheme{dove}
%StopShownPreambleCommands

\begin{document}
\begin{frame}{Umgebung \texttt{block}}
   {Vorgabe und modifiziertes Layout.}
\begin{block}<1->{Der Satz von Pythagoras}
   $c^2=a^2 + b^2$ \end{block}
\setbeamertemplate{blocks}[rounded][shadow=true]
\setbeamercolor{block body}{bg=normal text.bg!80!blue}
\setbeamercolor{block title}{bg=normal text.bg!80!red}
\setbeamerfont{block title}{size=\footnotesize,
  parent={structure,block body}}
\begin{block}<2->{Pythagoras}$c^2=a^2+b^2$\end{block}
\end{frame}
\end{document}