\mode<presentation>

\setbeamertemplate{background}{
  \begin{tikzpicture}
  \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
  \fill[color={rgb,255:red,37; green,20; blue,42}] (0,2) rectangle (\the\paperwidth,\the\paperheight);
  \fill[color={rgb,255:red,188; green,7; blue,68}] (0,0) rectangle(2.95,1.9);
  \fill[color={rgb,255:red,218; green,219; blue,214}] (3.05,0) rectangle(\the\paperwidth,1.9);
  \ifnum\thepage>1\relax%
   \fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
   \fi
  \end{tikzpicture}
}

% Title page
\defbeamertemplate*{title page}{Akatsuki}[1][]
{ 
   \vskip6cm%
    \begin{beamercolorbox}[wd=12cm,leftskip=3cm,sep=8pt,#1]{title page header}
      \usebeamerfont{title}\inserttitle\par%
    \end{beamercolorbox}%
    \vskip0.75cm%
    \begin{beamercolorbox}[wd=12cm,leftskip=3cm,#1]{author}
      \usebeamerfont{author}\insertauthor%
    \end{beamercolorbox}
     \vskip0.2cm%
    \begin{beamercolorbox}[wd=12cm,leftskip=3cm,#1]{date}
      \usebeamerfont{author}\insertdate%
    \end{beamercolorbox}
  \vfill
}

% Items
\setbeamertemplate{items}[square]
\setbeamertemplate{sections/subsections in toc}[square]