\usepackage{tcolorbox}
\tcbuselibrary{skins}
\tcbset{titre/.style={
	enhanced,
	hbox,
	tikznode,
	left=0mm,
	right=0mm,
	boxrule=0.4pt,
  	colframe=gray,
  	drop lifted shadow=black!50!gray,
  	after=\par\bigskip,
  	interior style={
		draw=gray!25,
		top color=gray!10,
		bottom color=white}
	},	
	info/.style = { 
	colframe = white,
	colback=gray!10}
}

\makeatletter
\def\@maketitle{%
  \noindent%
  \begin{tabular}{@{}p{0.47\textwidth}@{}p{0.02\textwidth}@{}p{0.47\textwidth}@{}}
  	\begin{tcolorbox}[titre]
  	\begin{minipage}{0.95\linewidth}
  		\begin{center}%
    	{\fontfamily{lmss}\bfseries\selectfont\LARGE \@title \par}%
    	\vskip .5em%
    	{\large
      	\lineskip .5em%
        \fontfamily{lmss}\selectfont\@author{} --- \@date}
  		\end{center}%
  		\par
    \end{minipage}
    \end{tcolorbox}
  	&
  	&
  	\begin{tcolorbox}[titre]
  	\begin{minipage}{\linewidth}
        \fontfamily{lmss}\selectfont\bfseries Nom, prénom:
  		\par
 		\vspace*{2em}
    \end{minipage}
    \end{tcolorbox}
	\end{tabular}
}
\makeatother