\listfiles
\documentclass{jarticle}
\usepackage{shadbox}

\def\iroh{色は匂へど散りぬるを我が世誰ぞつねならむ
有為の奥山今日越えて浅き夢見じ酔ひもせず}

\begin{document}


\shadbox{1}{abc}

\shadbox{2}{abc}

\shadbox{3}{abc}

\shadbox{4}{abc}

\shadbox{5}{abc}

\iroh

\shadbox{1}{\vbox{\hsize \linewidth
\iroh
}}

\shadbox{2}{\vbox{\hsize \linewidth
\iroh
}}

\shadbox{3}{\vbox{\hsize \linewidth
\iroh
}}

\shadbox{4}{\vbox{\hsize \linewidth
\iroh
}}

\shadbox{5}{\vbox{\hsize \linewidth
\iroh
}}


\end{document}
