# \marginpar border with grey background and round black edges

I often use \marginpar{} which is boring to me. Is there a way to add grey background and round black edges so it would look like this:

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1st solution, just using tikz

Here's a solution that renews the \marginpar command and uses TikZ to provide very flexible decorations

\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}

\let\oldmarginpar\marginpar
% renew the \marginpar command to draw
% a node; it has a default setting which
% can be overwritten
\renewcommand{\marginpar}[2][rectangle,draw,fill=orange,rounded corners]{%
\oldmarginpar{%
\tikz \node at (0,0) [#1]{#2};}%
}

\begin{document}
\marginpar{margin text here}
\lipsum[1]

\marginpar[fill=red,text=yellow,circle]{margin text here}
\lipsum[2]
\end{document}


2nd solution, using mdframed

This one uses the mdframed package for the framing, and defines an environment rather than a command. I've copied some code from the tufte document class to define an environment mymarginpar

\documentclass{article}
\usepackage[xcolor]{mdframed}
\usepackage{lipsum}
%====================================
%   shamelessly copied from tufte documentclass
%====================================
\makeatletter
% Margin float environment
\newsavebox{\@my@margin@floatbox}
\newenvironment{@my@margin@float}[1][-1.2ex]%
{%
\begin{lrbox}{\@my@margin@floatbox}%
\begin{minipage}{\marginparwidth}%
\hbox{}\vspace*{#1}%
\noindent%
}
{\end{minipage}%
\end{lrbox}%
\marginpar{\usebox{\@my@margin@floatbox}}%
}

% marginpar environment
\newenvironment{mymarginpar}[1][-1.2ex]%
{\begin{@my@margin@float}[#1]%
\begin{mdframed}[backgroundcolor=black!30,linecolor=red]%
}%
{\end{mdframed}\end{@my@margin@float}}
\makeatother

\begin{document}
\begin{mymarginpar}
margin text here
\end{mymarginpar}
\lipsum
\end{document}


If you want rounded corners, you can investigate the tikz-method of the mdframed, see the documentation for details.

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Nice to see my package ;-) However I don't know whether a standard TikZ implementation is easier. –  Marco Daniel Aug 23 '12 at 18:47
This example you provided returns an error: "! LaTeX Error: Command \marginpar already defined." –  71GA Aug 23 '12 at 18:58
@71GA not for me- are you sure you're using it as-is? Or have you tried to replace mymarginpar with marginpar? –  cmhughes Aug 23 '12 at 19:01
I am sure tried it once more. It doesnt work. I literally copied your example. –  71GA Aug 23 '12 at 21:03
@71GA not sure what's going on, perhaps an update is in order. Meanwhile, I've added another solution that uses tikz, perhaps you'll prefer this anyway :) –  cmhughes Aug 23 '12 at 22:14