\usepackage{graphicx}
\usepackage{geometry}
\usepackage{hyphenat}
\usepackage{sectsty}
\usepackage{wallpaper} % for the background image on title page

\definecolor{soii}{RGB}{0,47,167}
\definecolor{inrae}{RGB}{0,163,166}
\definecolor{inrae-blue}{RGB}{66,48,137}
\definecolor{inrae-red}{RGB}{237,110,108}

\chapterfont{\color{inrae-blue}} 
\sectionfont{\color{inrae-blue}} 
\subsectionfont{\color{inrae-blue}} 
\subsubsectionfont{\color{inrae-blue}}
\paragraphfont{\color{inrae-blue}}
\subparagraphfont{\color{inrae-blue}}