\usepackage{scrextend}
\usepackage[english,french]{babel} 
\usepackage[utf8]{inputenc} 
\usepackage{longtable}
\usepackage{booktabs}
\usepackage{colortbl}
\usepackage[a4paper, landscape,top=2.5cm, bottom=2.5cm, left=2.5cm, right=2.5cm]{geometry} 
\usepackage[font=small,labelsep=none]{caption}
\usepackage{background}

%\definecolor{table-row-color}{HTML}{C2ED77}
%\definecolor{table-row-color}{HTML}{D5FA96}
\definecolor{table-row-color}{HTML}{C2C2C2}
\definecolor{table-rule-color}{HTML}{E5F0D3}

%\arrayrulecolor{black!40}
\arrayrulecolor{table-rule-color}     % color of \toprule, \midrule, \bottomrule
\setlength\heavyrulewidth{0ex}        % thickness of \toprule, \bottomrule
\renewcommand{\arraystretch}{1.2}     % spacing (padding)
\let\oldlongtable\longtable
\let\endoldlongtable\endlongtable
\renewenvironment{longtable}{
\rowcolors{1}{}{table-row-color!100}  % row color
\oldlongtable} {
\endoldlongtable
\global\rownum=1\relax}

\backgroundsetup{
  scale=1,
  color=white,
  opacity=0.1,
  angle=0,
  contents={\includegraphics[width=\paperwidth,height=\paperheight]{images/background.png}}
}