This document contains the definition of two commands to include Yellow notes in the margin of a page.

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%%% Author:% Efraín Soto Apolinar.% http://www.aprendematematicas.org/%% This document contains the definition of% two commands to include Yellow notes in% the margin of a page.%\documentclass[12pt]{article}\usepackage{color}\usepackage{tikz}\usepackage{calc}\setlength{\parskip}{0ex}\setlength{\parindent}{0ex}\newlength{\yellownotewidth}\setlength{\yellownotewidth}{2.5cm}\newlength{\yellownoteheight}\setlength{\yellownoteheight}{2.5cm}% - - - - - - - - - - - -% Yellow note...% - - - - - - - - - - - -\newcommand{\yellownote}[1]{\marginpar{\vspace{-0.5\yellownoteheight}\begin{center}\begin{tikzpicture}\draw[white,fill=gray!25,opacity=0.75,shift={(-0.125,-0.125)}](0,0) rectangle (\yellownotewidth,\yellownoteheight);\draw[fill=yellow!35] (0,0) rectangle (\yellownotewidth,\yellownoteheight);\draw[opacity=0.45,fill=gray!50] (0.7\yellownotewidth,0) --(0.9\yellownotewidth,0.45) -- (\yellownotewidth,0.4) -- cycle;\node[blue,below] at (0.5\yellownotewidth,\yellownoteheight) {\begin{minipage}{\yellownotewidth-1em}\scriptsize\sf#1
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