Use the verbatim environment with small text (\small\begin{verbatim}) causes error in
the mdframe environment. To solve this, use the fancyvrb package with
\begin{Verbatim}[fontsize=\small]
\end{Verbatim}
Verbatim environment and mdframe package
When using an mdframed package to create a box around the verbatim environment,
\surroundwithmdframed[style=bluebox]{Verbatim}
the text following the environment becomes white. To fix this, use the fancyvrb package
and set the box to the Verbatim environment instead:
\usepackage{fancyvrb}
\surroundwithmdframed[style=bluebox]{Verbatim}
