%%
%% The LaTeX Companion, 3ed
%%
%% Example 8-2-10 on page I-591 in "Rotating a \protect \LaTeX {} box".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
\newcommand\HR{\rule{1em}{0.4pt}}
\newcommand\bluefbox[1]{\textcolor{blue}{\setlength\fboxsep{0pt}%
                                      \fbox{\textcolor{black}{#1}}}}
%StartShownPreambleCommands
\usepackage{color,graphics} % or graphicx
%StopShownPreambleCommands

\begin{document}
\HR\bluefbox{\rotatebox{45}{%
   \fbox{\parbox{3em}{Red\\Green\\Blue}}}}%
\HR\bluefbox{\rotatebox{45}{%
   \fbox{\parbox[t]{3em}{Red\\Green\\Blue}}}}%
\HR\bluefbox{\rotatebox{45}{%
   \fbox{\parbox[b]{3em}{Red\\Green\\Blue}}}}\HR
\end{document}