Page de garde beamer : changement de couleur

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\documentclass{beamer}
\usetheme{Boadilla}
\usecolortheme{seahorse}
\usefonttheme{serif}
\usepackage[T1]{fontenc}
\usepackage[french]{babel}
\usepackage{lipsum}
%\usepackage{graphicx,xcolor}
%\usepackage{amsmath,amssymb,amsfonts}
\title{Titre}
\subtitle{Sous-titre}
\author{Auteur}
\date{\today}
\setbeamercolor{author}{fg=green}
\setbeamercolor{date}{fg=red}
\begin{document}
\begin{frame} 
    \titlepage
\end{frame}
\end{document}
 
 
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