\usepackage{paracol}
\newlength{\notesep}

% All the models uses two columns.
% At any time in the RST document, you can add elements in the sidebar using
% the sidebar directive.
%
%   .. sidebar:: Informations
%   
%     * 17 allée des cerisiers
%     * 75001 Paris |phoneicon|
%     * 01 23 45 67 89 |mailicon|
%     * email@example |noicon|
%   
%   You can close the sidebar at any time, but this requires to use latex code in the document
%   
%   .. raw:: latex
%   
%       \flushpage
%       \end{paracol}
%       \newgeometry{left=3cm,right=3cm,bottom=1cm,top=1cm}


% Switch in paracol mode from the begining of the document
% This can be disabled by defining \nocolumns before loading
% this template.
% 
% \def\nocolumns{}
% 
% The column is supposed to be on the left on the document, with the index 0. You
% can change this by defining a counter sidebarindex with
% 
% \newcounter{sidebarindex}
% \setcounter{sidebarindex}{1}

\ifdefined\sidebarindex
\else
    \newcommand\sidebarindex{0}
\fi

\ifdefined\nocolumns
\else
    \AtBeginDocument{%
      \begin{paracol}{2}
    }
\fi

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

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

% Une commande dédiée pour les notes de marge
\newcommand{\DUsidebar}[1]{%
    \switchcolumn[\sidebarindex]
  \begin{changemargin}{0.7cm}{0.7cm}
  % Sélectionne la police alternative
  \AltFont\selectfont
  \ifdefinedcolor{textsidecolor}{\color{textsidecolor}}{}
  #1
  \end{changemargin}
  \vspace{\notesep}
  \switchcolumn
  \ifdefinedcolor{textsidecolor}{\color{black}}{}
}

% If the column is still active, make it go to the bottom of the page.
\makeatletter
\AtEndDocument{%
  \ifthenelse{\equal{\@currenvir}{paracol}}{\flushpage\end{paracol}}{}
}
\makeatother