%%
%% The LaTeX Companion, 3ed
%%
%% Example 8-4-19 on page I-623 in "Adding overlays, watermarks, and other backgrounds".
%%
%% 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{135.0pt}

%StartShownPreambleCommands
\usepackage[skins]{tcolorbox}
%StopShownPreambleCommands

\begin{document}
 \begin{tcolorbox}[enhanced,
                   title=A graphic as a watermark,
                   watermark graphics=latex-logo.pdf,
                   watermark opacity=0.2,
                   watermark zoom=0.9]
   This shows a box with the \LaTeX\ hummingbird logo
   as a background picture.
 \end{tcolorbox}
\end{document}