diff --git a/cours/cours_devoir.cls b/cours/cours_devoir.cls
new file mode 100644
index 0000000..ddb0a87
--- /dev/null
+++ b/cours/cours_devoir.cls
@@ -0,0 +1,196 @@
+%%%
+%%%
+%%% Classe : cours_devoir.cls
+%%% Version : 1.0
+%%% Date : 01/04/17
+%%% Auteur : Jeff LANCE
+%%%
+%%%
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesClass{cours_devoir}[2016/11/09 Document de devoir, V1.0]
+
+
+
+
+%-- PARENT CLASS
+\LoadClass[a4paper, 11pt]{article}
+%---------------
+
+
+
+
+%-- PACKAGES CALLS
+%%% PERSO %%%
+\RequirePackage{commun}
+\RequirePackage{shortcuts}
+%%%%%%%%%%%%%
+
+%%% AUTRES %%%
+\RequirePackage{comment}
+\RequirePackage{geometry}
+\RequirePackage{fancyhdr}
+\RequirePackage{titlesec}
+\RequirePackage{enumitem}
+\RequirePackage{environ}
+%%%%%%%%%%%%%%
+%-----------------
+
+\makeatletter
+
+
+
+
+%-- SETTINGS
+%%% PATHS %%%
+\graphicspath{{images/}}
+%%%%%%%%%%%%%
+
+
+%%% METAPOST %%%
+\ifpdf
+  \DeclareGraphicsRule{*}{mps}{*}{}
+\fi
+%%%%%%%%%%%%%%%%
+
+
+%%% TikZ %%%
+\usetkzobj{all} % on charge tous les objets
+%%%%%%%%%%%%
+
+
+%%% PAGE %%%
+\geometry{a4paper, hmargin=.8cm, vmargin=2cm, centering, nofoot, headheight=1cm, layoutvoffset=.5cm}
+%%%%%%%%%%%%
+
+
+%%% TITRE, EN-TÊTE, PIED,... %%%
+\thispagestyle{fancy}
+\pagestyle{empty}
+\fancyhead{}
+\fancyfoot{}
+\renewcommand{\headrulewidth}{0.0pt}
+\renewcommand{\footrulewidth}{0.0pt}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+
+%%% SECTIONS %%%
+\titlelabel{\textbf{\thetitle}}
+\titleformat{\section}[runin]{\rmfamily\bfseries\large}{\thesection}{.5em}{}[\\]
+\titleformat{\subsection}[runin]{\rmfamily\bfseries\normal}{\thesubsection)}{.5em}{}[\\]
+%%%%%%%%%%%%%%%%
+
+
+%%% LISTS %%%
+\setlist[enumerate,1]{label=\textbf{\arabic*.},
+  font=\sffamily,
+  leftmargin=1.2em,
+  noitemsep,resume}
+\setlist[enumerate,2]{label=\textbf{\alph*)},
+  font=\sffamily,
+  leftmargin=1.2em,
+  noitemsep
+}
+\setlist[enumerate,3]{label={\textcircled{\small\Alph*}},
+  font=\sffamily,
+  leftmargin=1.2em,
+  noitemsep
+}
+%%%%%%%%%%%%%
+
+
+%%% MDFRAMED %%%
+% global options
+\mdfsetup{
+    frametitlealignment=\raggedright,%
+    innerbottommargin=2em,%
+}
+
+% styles
+\tikzset{
+    symbol/.style={
+        rectangle, draw=white,
+        fill=white, scale=1,
+        overlay
+    }
+}
+
+% idea: a shadowed square frame with a light bulb icon at upper left
+\mdfdefinestyle{tips}{%
+  linecolor=white,linewidth=1pt,%
+  tikzsetting={draw=black,dotted,line width=1pt},%
+  leftmargin=0,rightmargin=0,%
+  innertopmargin=0em,innerbottommargin=0.5em,%
+  innerleftmargin=1em,innerrightmargin=.5em,%
+  skipabove=0,skipbelow=0,%
+  frametitlerule=false,%
+  frametitlebackgroundcolor=white!0,%innertopmargin=\topskip,%
+  frametitleaboveskip=0,frametitlebelowskip=0
+  nobreak=true,%
+  xcolor,%
+  hidealllines=false, %leftline=true, % topline=true, bottomline=true,%
+  % shadow=true,%
+  % backgroundcolor=gray!40,% FOR TEST ONLY
+  firstextra={\path let \p1=(P), \p2=(O) in ($(\x2,-.4)+1.0*(0,\y1)$)
+              node[symbol] { \faLightbulbO };
+             },%
+  secondextra={\path let \p1=(P), \p2=(O) in ($(\x2,-.4)+1.0*(0,\y1)$)
+               node[symbol] { \faLightbulbO };
+              },%
+  middleextra={\path let \p1=(P), \p2=(O) in ($(\x2,-.4)+1.0*(0,\y1)$)
+               node[symbol] { \faLightbulbO };
+              },%
+  singleextra={\path let \p1=(P), \p2=(O) in ($(\x2,-.4)+1.0*(0,\y1)$)
+               node[symbol] { \faLightbulbO };
+              },%
+}
+
+\mdtheorem[style=tips, theoremseparator={}, theoremspace={}]{tips}{}
+
+\RenewDocumentEnvironment{tips}{ o } {%begin
+  \begin{tips*}
+}{%end
+  \end{tips*}
+}
+%%%%%%%%%%%%%%%%
+
+%-----------
+
+
+
+
+%-- OWN COMMANDS
+
+%% \lHead{TEXT}
+%% partie gauche du titre
+%\NewDocumentCommand \lHead { g } {
+%  \fancyhead[LO]{#1\\}
+%  \fancyhead[LE]{}
+%}
+%
+%% \cHead{TEXT}
+%% partie centrale du titre
+%\NewDocumentCommand \cHead { g } {
+%  \fancyhead[CO]{\textbf{MATHÉMATIQUES}\\#1\\}
+%  \fancyhead[CE]{}
+%}
+%
+%% \rHead{TEXT}
+%% partie droite du titre
+%\NewDocumentCommand \rHead { g } {
+%  \fancyhead[RO]{#1\\}
+%  \fancyhead[RE]{}
+%}
+
+% \headrule
+% affiche un trait de séparation netre le titre et le contenu du document
+%\NewDocumentCommand \headrule { } {
+%  \renewcommand{\headrulewidth}{1.0pt}
+%}
+
+%---------------
+
+
+
+
+\makeatother