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\RequirePackage{colortbl, tabularx}
\@ifundefined{comment}{}% do nothing if the comment environment is not defined
{% redefine the comment environment if it is defined
\renewenvironment{comment}
{% replaces \begin{comment}
\par\medskip\noindent
\tabularx{\textwidth}{|>{\columncolor[gray]{0.9}}X|}
\hline
\emph{\textbf{Kommentar:}}% You can use any other text instead of "Comment:" or leave it
}
{replaces \end{comment}
\endtabularx\hrule\par\medskip
}
}%
%
Thanks in advance!
