\usepackage{titlesec}


%\providecommand{\DUdocumentsubtitle}[1]{%
%  \begin{flushright}{\Huge#1}\end{flushright}%
%}

\providecommand*{\DUdocumentsubtitle}[1]{%
  \Large
  \CaviarDreamsFont\selectfont
  \color{black}
  \begin{flushright}
  #1
  \end{flushright}
}

\makeatletter

\usepackage{mdframed}
\def\@maketitle{%

    \begin{mdframed}[
        topline=false,
        leftline=false,
        rightline=false,
        innertopmargin=1cm,
        innerbottommargin=1cm
    ]
  \textcolor{sidecolor}{\fontsize{1.2cm}{2cm}\EBLigatures\selectfont \@title}
  \end{mdframed}
}
\makeatother


\newcommand{\periodafter}[1]{#1.}

% Titre de niveau 0
\titleformat{\section}
  {\EBLigatures\selectfont\em\LARGE}
  {\thesection}
  {0em}
  {\textcolor{sidecolor}}
  [{\vspace{1cm}}]

% Titre de niveau 1
\titleformat{\subsection}
  {\CaviarDreamsFont\selectfont\Large}
  {\thesection}
  {0em}
  {}
  []

% Titre de niveau 2
\titleformat{\subsubsection}
  {\large}
  {\thesubsection}
  {}
  {\textcolor{black!69}}

% Titre de niveau 3
\titleformat{\subsubsubsection}
  {\bfseries\normalsize}
  {\thesubsubsection}
  {2em}
  {}
  {}