Fancy remark environment

Question

I have this:

\usepackage{picins}
\shadowthickness{2pt}
\newcommand{\sidenote}[1]{
    \begin{center}
    \hpic(0.95\textwidth,0pt)[rs]{
        \parbox[b]{0.9\textwidth}{\small
             \bigskip{#1}\bigskip
        }
    }
    \end{center}
}

Which generates a nice (shadowed) box with padding. The problem is that \sidenote cannot accept formatted text (i.e. paragraphs).

Is it possible to define a "FancyRemark" environment which has the same visual style but does allow for paragraphs and display style math?

Answer 1

Sorry, picins somehow does not seem to work at the moment, on this machine.

This is what I guess you wanted:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shadows}
\usepackage{environ}
\NewEnviron{sidenote}{%
  \begin{tikzpicture}[font=\normalsize]
      \node [text width=0.9\linewidth,draw,drop shadow,fill=white,inner sep=10pt]{%
           \BODY
        };
   \end{tikzpicture}
}
\begin{document}
\begin{sidenote}
  sfasdfasdfasdf
\begin{equation}
1+2=3
\end{equation}
\end{sidenote}
\end{document}

Please give me a preview, if you want me to tweak the looks to your expectations.