\mode<presentation> 
% Requirement
\RequirePackage{tikz}

\setbeamertemplate{background}{
    \begin{tikzpicture}
        \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
        \ifnum\thepage>1\relax%
            \fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
            \node [below left] at (current bounding box.north east) 
            {\includesvg[width=.15\paperwidth]{./images/TH_OWL_Logo_small}};
            \node[above right] (0,0) {
                \footnotesize
                \hspace{.05\paperwidth} 
                {\tiny\inserttitle \space | \insertshortauthor \space | \insertdate}
                };
        \else 
            \node [below right] at (.55*\the\paperwidth,.6*\the\paperheight) 
            {\includesvg[width=.55\paperwidth]{./images/TH_OWL_Logo_tiny}};
        \fi
        \definecolor{th-red}{HTML}{ed114c};
        \fill[color=th-red] (0.5,0) rectangle(.05*\the\paperwidth,\the\paperheight);
    \end{tikzpicture}
}

%\setbeamertemplate{footline}{
%    \begin{tikzpicture}
%        \useasboundingbox (0,0) rectangle(\th\paperwidth,.1*\the\paperheight);
%        \ifnum\thpage>1\relax%
%        \fi
%    \end{tikzpicture}
%}

% Title page
\defbeamertemplate*{title page}{th-owl}[1][]
{ 
    \begin{center}
        \vspace{-.2\paperheight}
        \Huge
        \textbf{\inserttitle}\\
        \vspace{.05\paperheight}
        \Large
        \insertsubtitle\\
        \vspace{.1\paperheight}
        \normalsize
        \insertauthor\\
        \vspace{.03\paperheight}
        \insertdate
    \end{center}
}

\mode <all>