\newlength{\notesep}

% Une commande dédiée pour les notes de marge
\setlength{\columnsep}{1cm}
\columnratio{0.71}

\ifdefinedcolor{backsidecolor}{%
  \backgroundcolor{c[1]}{backsidecolor}
}{}

\setlength{\columnseprule}{0.2pt}

\def\changemargin#1#2{\list{}{\rightmargin#2\leftmargin#1}\item[]}
\let\endchangemargin=\endlist 

\newcommand{\DUsidebar}[1]{%
  \switchcolumn[1]
  \begin{changemargin}{0.5cm}{0.0cm}
  \small
  \ifdefinedcolor{textsidecolor}{\color{textsidecolor}}{}
  #1
  \end{changemargin}
  \vspace{\notesep}
  \switchcolumn
}

\newcommand{\DUtitletitle}[1]{%
        \begin{CaviarDreamsFont}%
        \textbf\selectfont\color{sidecolor}{\uppercase{#1}}%
        \end{CaviarDreamsFont}%
 }

\AtEndDocument{%
  \flushpage
  \end{paracol}
}

\let\oldtitle\maketitle
\renewcommand{\maketitle}{%
  \oldtitle
  \thispagestyle{fancy}
  \begin{paracol}{2}%
}