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I want to define the following in my preamble, to write in my .tex file just
\begin{Anmerkung}...\end{Anmerkung}
\reversemarginpar\todo[noline,bordercolor=white]{\textcolor[rgb]{1,1,1}{\textbf{Anmerkung}}}
\definecolor{darkred}{rgb}{0,0.3,0.7}
\begin{Document}
\begin{Anmerkung}some text \end...