Hello I want to put the chapter (picture 1) in a colorful table in gray and in the middle of the page, as in picture 2.
\begingroup % start a TeX group
\color{gray}% or whatever color you wish to use
\chapter*{Introduction générale} \\
\endgroup
Picture 1
picture 2
This is the code I have put together so far:
\documentclass[12pt]{report}
\usepackage[francais]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fancybox}
%%%%%%%%%%%%%%%%%%%%%%%%%%%Page en tete
\usepackage{lipsum}
\usepackage{xcolor}
\usepackage{tikz}
\usepackage{appendix}
\usepackage{mathtools,amsfonts,amssymb,amsthm}
\usepackage[most]{tcolorbox}
\definecolor{ocre}{RGB}{52,177,201}
\definecolor{ultramarine}{RGB}{0,45,97}
\definecolor{myblue}{gray}{0.6}
\definecolor{mybluei}{gray}{0.75}
\definecolor{myblueii}{gray}{0.8}
\definecolor{myblueiii}{gray}{0.85}
\definecolor{myblueiiii}{gray}{0.93}
\usepackage{fourier}
\usepackage[explicit,calcwidth]{titlesec}
\renewcommand\thechapter{\arabic{chapter}}
\newcommand\chapnumfont{%
\fontsize{50}{120}\color{myblueii}\selectfont%
}
\newcommand\chapnamefont{%
\normalfont\color{white}\scshape\small\bfseries
}
\titleformat{\chapter}
{\normalfont\huge\filleft}
{}
{0pt}
{\stepcounter{chapshift}%
\begin{tikzpicture}[remember picture,overlay]
\fill[myblueiii]
(current page.north west) rectangle ([yshift=-13cm]current page.north
east);
\node[
fill=mybluei,
text width=2\paperwidth,
rounded corners=6cm,
text depth=18cm,
anchor=center,
inner sep=0pt] at (current page.north east) (chaptop)
{\thechapter};%
\node[
anchor=south east,
inner sep=0pt,
outer sep=0pt] (chapnum) at ([xshift=-20pt]chaptop.south)
{\chapnumfont\thechapter};
\node[
anchor=south,
inner sep=0pt] (chapname) at ([yshift=2pt]chapnum.south)
{};
\node[
anchor=north east,
align=right,
inner xsep=0pt] at ([yshift=-0.5cm]chapname.east|-chapnum.south)
{\parbox{.7\textwidth}{\raggedleft#1}};
\end{tikzpicture}%
}
\titleformat{name=\chapter,numberless}
{\normalfont\huge\filleft}
{}
{0pt}
{\begin{tikzpicture}[remember picture,overlay]
\fill[myblueiii]
(current page.north west) rectangle ([yshift=-13cm]current page.north
east);
\node[
fill=mybluei,
text width=2\paperwidth,
rounded corners=6cm,
text depth=18cm,
anchor=center,
inner sep=0pt] at (current page.north east) (chaptop)
{};%
\node[
anchor=south east,minimum width=2in,
inner sep=0pt,
outer sep=0pt] (chapnum) at ([xshift=-20pt]chaptop.south)
{};
\node[
anchor=south,
inner sep=0pt] (chapname) at ([yshift=2pt]chapnum.south)
{};
\node[
anchor=north east,
align=right,
inner xsep=0pt] at ([yshift=-0.5cm]chapname.east|-chapnum.south)
{\parbox{.7\textwidth}{\raggedleft#1}};
\end{tikzpicture}%
}
\titlespacing*{\chapter}{0pt}{0pt}{3.5in}
\titlespacing*{name=\chapter,numberless}{0pt}{0pt}{3.5in}
\titleformat{\section}
{\addtolength{\titlewidth}{2pc}\normalfont\Large\sffamily\bfseries}
{\colorbox{myblueii}{\parbox{2cm}{\strut\color{white}\hfill\thesection}}}
{1em}{#1}
[{\titleline*[l]{\color{myblueii}\titlerule[2pt]}}]
\titleformat{\subsection}
{\addtolength{\titlewidth}{2pc}\normalfont\large\sffamily}
{\colorbox{myblueii}{\parbox{2cm}
{\strut\color{white}\hfill\thesubsection}}}
{1em}{#1}
[{\titleline*[l]{\color{myblueii}\titlerule[2pt]}}]
\usetikzlibrary{calc}
\pagestyle{plain}
\newcounter{chapshift}
\addtocounter{chapshift}{-1}
\newcommand\BoxColor{myblueii}
\def\subsectiontitle{}
\renewcommand{\sectionmark}[1]{\markright{\sffamily\normalsize#1}{}}
\renewcommand{\subsectionmark}[1]{\def\subsectiontitle{#1}}
\usepackage{etoolbox}
\renewcommand{\chaptermark}[1]{\markboth{\sffamily\normalsize\bfseries \ #1}
{}}
\renewcommand{\sectionmark}[1]{\markright{\sffamily\normalsize#1}{}}
\makeatletter
\renewcommand{\cleardoublepage}{
\clearpage\ifodd\c@page\else
\hbox{}
\vspace*{\fill}
\thispagestyle{empty}
\newpage
\fi}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Je veux utiliser néanmoins des fontes qui « paraissent bien » en PDF
\usepackage[cyr]{aeguill}
%% J'aime bien pouvoir contrôler mes hauts de page !
\usepackage{fancyhdr}
\usepackage{enumitem}
%% Je veux pouvoir inclure des figures...
\makeatletter
\setlength{\@fptop}{0pt}
\makeatother
%% ... des figures ``jpeg'' ou ``pdf'' ou "png"
\DeclareGraphicsExtensions{.jpg,.pdf,.png}
%% Je veux créer des Hyperdocuments
\usepackage[pdftex,colorlinks=true,linkcolor=black,citecolor=blue,urlcolor=bl
ue]{hyperref}
%% Je contrôle la taille de ma zone imprimée...
\usepackage{anysize}
%% ...en définissants les marges {gauche}{droite}{haute}{basse}
\marginsize{22mm}{14mm}{12mm}{25mm}
\setlength{\headheight}{50pt}
\setlength{\footskip}{28.44942pt}
%% J'inclue une bibliographie ; j'ai donc besoin du package natbib
\usepackage{natbib}
\usepackage{colortbl}
\definecolor{bleuy}{rgb}{0.4,0.6,0.8}
\definecolor{blue(pigment)}{rgb}{0.2, 0.2, 0.6}
\definecolor{bleudefrance}{rgb}{0.19, 0.55, 0.91}
\definecolor{yaleblue}{rgb}{0.06, 0.3, 0.57}
\definecolor{royalblue}{rgb}{0.0, 0.14, 0.4}
\definecolor{oxfordblue}{rgb}{0.0, 0.13, 0.28}
\definecolor{darkmidnightblue}{rgb}{0.0, 0.2, 0.4}
\definecolor{spirodiscoball}{rgb}{0.06, 0.75, 0.99}
\usepackage{ulem}
\usepackage{graphicx} % to insert PostScript figures
\usepackage[strict]{changepage}
\usepackage{pifont}
\usepackage{capt-of}
\usepackage{ragged2e}
% new
% new
\usepackage[Lenny]{fncychap}
\usepackage{booktabs, % new
hhline,
makecell, % new
multirow,
tabularx} % new
\renewcommand\theadfont{\small\bfseries}
\renewcommand\theadgape{}
\newcolumntype{L}{>{\RaggedRight\arraybackslash}X} % redefined
%---------------- show page layout. don't use in a real document!
\definecolor{Gray}{gray}{0.9}
%%%%%%%%%table size
%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{fancyhdr}
\renewcommand{\headrule}{{\color{myblueii}%
\hrule width\headwidth height\headrulewidth depth\headrulewidth}}
\pagestyle{fancy}
\fancyhf{} \fancyhead[LE,RO]{\sffamily\normalsize\colorbox{myblueii}
{\color{white}\sffamily\bfseries\strut\quad\thepage\quad}}
\fancyhead[LO]{\textcolor{mybluei} \rightmark%
\begin{tikzpicture}[overlay,remember picture]
\node[fill=\BoxColor,inner sep=-1pt,rectangle,text width=1cm,
text height=28cm,align=center,anchor=north east]
at ($ (current page.north east) $)
{\rotatebox{90}{\parbox{18cm}{%
\centering\textcolor{white}{\bfseries\scshape\thechapter.\leftmark
\hspace{2cm}\rightmark\hspace{2cm}\thesubsection~\subsectiontitle}}}};
\end{tikzpicture}}
\fancyhead[RE]{\textcolor{mybluei}\leftmark%
\begin{tikzpicture}[overlay,remember picture]
\node[fill=\BoxColor,inner sep=0pt,rectangle,text width=1cm,
text height=28cm,align=center,anchor=north west]
at ($ (current page.north west) $)
{\rotatebox{90}{\parbox{18cm}{%
\centering\textcolor{white}{\bfseries\scshape\thechapter.\leftmark
\hspace{2cm}\rightmark\hspace{2cm}\thesubsection~\subsectiontitle}}}};
\end{tikzpicture}}
\renewcommand{\headrulewidth}{.9pt}
\addtolength{\headheight}{2.5pt}
\newcommand{\footrulecolor}[1]{\patchcmd{\footrule}{\hrule}
{\color{#1}\hrule}{}{}}
\renewcommand{\headrulewidth}{.5pt}
\addtolength{\headheight}{2.5pt}
\renewcommand{\footrulewidth}{.9pt}
\fancyfoot[LE,RO]{\footnotesize\bfseries\itshape Foot 1}
\fancyfoot[C]{\footnotesize\bfseries Foot 2}
\fancyfoot[RE,LO]{\footnotesize\bfseries\itshape Foot 3}
\fancypagestyle{plain}{%
\fancyhf{}%
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
}
%%%%%%%%%%%%%%%%%%%%%%%%Page de garde
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setcounter{secnumdepth}{3}
\usepackage{lscape}
\usepackage{fetamont}
\newcommand{\fb}[1]{\dofb#1}
\newcommand{\dofb}[1]{\textbf{#1}\nobreak\hspace{0pt}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%chapt header
\fancypagestyle{chapter}{%
\lhead[]{\fancyplain{}{\bfseries\leftmark}}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%BBB%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\usepackage{showframe}
\begin{document}
%% Voilà des hauts de page comme je les aime :
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{\chaptername\ \thechapter. #1}{}}
\renewcommand{\sectionmark}[1]{\markright{\thesection. #1}}
\lhead[]{\fancyplain{}{\bfseries\leftmark}}
\cfoot{}
%% Voilà mes légendes de figures comme je les aime :
\makeatletter
\def\figurename{{\protect\sc \protect\small\bfseries Fig.}}
\def\f@ffrench{\protect\figurename\space{\protect\small\bf
\thefigure}\space}
\let\fnum@figure\f@ffrench%
\let\captionORI\caption
\def\caption#1{\captionORI{\rm\small #1}}
\makeatother
%%%%%%%%%%
%%%%%%%%Page garde
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begingroup % start a TeX group
\color{gray}% or whatever color you wish to use
\chapter*{Dédicaces}
\endgroup
\end{document}
