\documentclass{beamer}

\usepackage{xcolor}
\usepackage[framemethod=tikz]{mdframed}

\definecolor{bluelimos}{RGB}{47,72,152}

\beamertemplatenavigationsymbolsempty

\mdfdefinestyle{mystyle}{
linecolor=bluelimos,outerlinewidth=0pt,
frametitlerule=true,frametitlefont=\sffamily\color{white},
frametitlerulewidth=0pt,frametitlerulecolor=bluelimos,
frametitlebackgroundcolor=bluelimos,
backgroundcolor=white,
innertopmargin=\topskip,
roundcorner=5pt
}

\newmdenv[style=mystyle,roundcorner=2pt,outerlinecolor
= bluelimos]{Lblock}
\newenvironment{blocklimos}[1]
  {\begin{Lblock}[frametitle={#1}]}
  {\end{Lblock}}

\author{Firstname Lastname} 
\title{Title} 
\date{\today} 
%\setbeamercovered{transparent} 
%\setbeamertemplate{navigation symbols}{} 
\logo{\includegraphics[height=.75cm]{logo/logo_limos_long_coul_def.png}\hspace{240pt}} 
\institute{LIMOS} 
%\subject{}


\setbeamercolor{footline}{fg=bluelimos}
\addtobeamertemplate{navigation symbols}{}{%
    \usebeamerfont{footline}%
    \usebeamercolor[fg]{footline}%
    \hspace{1em}%
    \insertframenumber/\inserttotalframenumber
}


\setbeamercolor{frametitle}{fg=bluelimos}
\setbeamercolor{title}{fg=bluelimos}
\setbeamercolor{author}{fg=bluelimos}
\setbeamercolor{date}{fg=bluelimos}



\begin{document}

\maketitle


\section{Part one}
\begin{frame}
 
\begin{blocklimos}{The Title}
some text
    some more text
\end{blocklimos}

\end{frame}



\end{document}
