\usepackage[utf8]{inputenc}

% fonts and colors
\usepackage[defaultfam,tabular,lining]{montserrat}

\setbeamercolor{normal text}{fg=black,bg=white}
\setbeamercolor{alerted text}{fg=red!50!black}
\setbeamercolor{example text}{fg=green!50!black}

\setbeamercolor{title}{fg=white}
\setbeamerfont{title}{size=\Huge}
\setbeamerfont{title}{series=\bfseries}

\setbeamercolor{subtitle}{fg=white}
\setbeamerfont{subtitle}{size=\Large}

\setbeamercolor{author}{fg=white}
\setbeamerfont{author}{size=\Large}

\setbeamercolor{institute}{fg=white}
\setbeamerfont{institute}{size=\large}

\setbeamercolor{date}{fg=black}
\setbeamerfont{date}{size=\large}

\setbeamercolor{frametitle}{fg=white}
\setbeamerfont{frametitle}{size=\LARGE}
\setbeamerfont{framesubtitle}{size=\large}

\makeatletter
\setbeamertemplate{frametitle}{%
    \vbox{}\vskip-0.5em%
    \begin{beamercolorbox}[wd=.7\paperwidth]{frametitle}
        \usebeamerfont{frametitle}%
        \strut\insertframetitle\strut\par%
    \end{beamercolorbox}
    \ifx\insertframesubtitle\@empty%
      \vskip.9em
  \else%
      \vskip-0.3em
    \begin{beamercolorbox}[wd=.68\paperwidth]{frametitle}
        \usebeamerfont{framesubtitle}%
        \strut\insertframesubtitle\strut\par%
    \end{beamercolorbox}
  \fi
}
\makeatother

\usepackage{tikz}
\usetikzlibrary{calc,intersections,positioning,fadings,through}

% footline
\setbeamertemplate{navigation symbols}{}
\setbeamertemplate{footline}{%
    \leavevmode%
    \hskip3pt%
      \insertframenumber
	\hfill
	\SPEAKER
        \hfill
	\TITLE
	\hfill
    \raisebox{-0.8mm}{\includegraphics[height=0.7cm]{../logo-NGI_TALER_Bold.png}}
    \vskip0pt%
}

% background

\usepackage{xcolor}
\definecolor{left}{RGB}{0,66,179}

\setbeamertemplate{title page}
{%\leavemode%
   \begin{beamercolorbox}[wd=\the\paperwidth, ht=\the\paperheight,ignorebg,center]{}
    \begin{tikzpicture}[overlay, remember picture]
        \fill [left color=left, right color=left!50!black] (current page.north west) -- (current page.north east) -- ($(current page.north east)+(0,-6.5)$) -- ($(current page.north west)+(5,-6.5)$) -- ($(current page.north west)+(4.5,-6.8)$) -- ($(current page.north west)+(4,-6.5)$) -- ($(current page.north west)+(0,-6.5)$);
        \end{tikzpicture}
    \end{beamercolorbox}%
    \vspace*{-8cm}

    \begin{beamercolorbox}[sep=8pt,left]{title}
    {\usebeamerfont{title}\inserttitle\par}%
    {\usebeamerfont{subtitle}\insertsubtitle\par}%
    \end{beamercolorbox}%
    \vskip1em\par
    \begin{beamercolorbox}[sep=8pt,left]{author}
  \usebeamerfont{author}\insertauthor
    \end{beamercolorbox}
    \begin{beamercolorbox}[sep=8pt,left]{institute}
  \usebeamerfont{inst}\insertinstitute\\
    \end{beamercolorbox}%

    \begin{beamercolorbox}[sep=5pt,left]{date}
  \usebeamerfont{date}\insertdate
    \end{beamercolorbox}
   \vspace*{2.5cm}
}

\setbeamertemplate{background canvas}
{%\leavemode%
    \begin{tikzpicture}[overlay, remember picture]
        \fill [left color=left, right color=left!50!black] (current page.north west) -- (current page.north east) -- ($(current page.north east)+(0,-2)$) -- ($(current page.north west)+(5,-2)$) -- ($(current page.north west)+(4.5,-2.3)$) -- ($(current page.north west)+(4,-2)$) -- ($(current page.north west)+(0,-2)$);
  \end{tikzpicture}
}