%% 
%%  A DANTE-Edition example
%% 
%%  Example 02-17-1 on page 87.
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{177.70511pt}
\setlength\parindent{0pt}

\usepackage{booktabs, tabularkv}

\begin{document}
\fbox{%
 \begin{tabularkv}[width=2.25in,height=0.75in,
    valign=center]{@{}l@{\extracolsep{\fill}}r@{}}
  top left& top right \\\interrowfill
  \multicolumn{2}{@{}c@{}}{bounding box}\\
  \interrowfill
  bottom left & bottom right
 \end{tabularkv}}
\end{document}