\documentclass[12pt]{beamer}

\usepackage{geometry}
\geometry{lmargin=1.4cm,rmargin=2cm,tmargin=1cm}

\usepackage{eso-pic}

%\setbeamertemplate{blocks}[rounded][shadow=true]
\setbeamercovered{transparent}

\headheight=2cm

\title{Beamer Style}
\subtitle{How I Learned to Stop Worrying and Love the Slide}
\author{Sayyed Ahmad Mousavi}
\institute{\color{red} Department of Pure Mathematics\\
Faculty of Mathematics and Computer \\
Shahid Bahonar University of Kerman}
\date{The 45th Annual Iranian Mathematics Conference}

\begin{document}
%\usebackgroundtemplate{\includegraphics[width=\paperwidth,height=\paperheight]{back}}
\usebackgroundtemplate{%
\AddToShipoutPicture*{\put(0,0){\includegraphics[height=\paperheight,width=\paperwidth]{back}}}
}


%%%%%%%%%%%%%%%%%%%%%%%%%%
\frame{\titlepage}


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%%%%%%%%%% Content starts here %%%%%%%%%%
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\begin{frame}{Prerequisites}
  \begin{block}{LaTeX}
  \begin{itemize}
    \item Obviously some basic LaTeX knowledge is necessary
    \item Some more features will be provided here
  \end{itemize}
  \end{block}

  \begin{block}{Beamer}
  \begin{itemize}
    \item You'll learn them by looking at this presentation source
  \end{itemize}
  \end{block}
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}{Goals}
  \begin{block}{Goal}
  \begin{itemize}
    \item Learn how to make well structured slides
    \item Using a beautiful theme 
    \item Take over the world
    \item Relax...
  \end{itemize}
  \end{block}
\end{frame}
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\begin{frame}{Thanks}
\begin{center}
\huge Questions ?
\end{center}
\vspace{3cm}
\begin{flushright}
Sayyed Ahmad Mousavi

\structure{\footnotesize{s.a.mousavi@math.uk.ac.ir}}
\end{flushright}
\end{frame}
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\end{document}