% footline
% delete navigation below
\setbeamertemplate{navigation symbols}{}
% define footline
\makeatother
\setbeamertemplate{footline}
{
    \leavevmode%
    \hbox{%
    \begin{beamercolorbox}[wd=.4\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{author in head/foot}\insertshortauthor
    \end{beamercolorbox}
    
    \begin{beamercolorbox}[wd=.6\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshorttitle\hspace*{13em}
    \insertframenumber{} / \inserttotalframenumber\hspace*{0ex}
    \end{beamercolorbox}}
    
    \vskip0pt%
}
\makeatletter
% footline color
\setbeamercolor{author in head/foot}{fg=black, bg=mygrey!5!white}
\setbeamercolor{title in head/foot}{fg=black, bg=mygrey!5!white}
% sidebar color
\setbeamercolor{structure}{fg=main, bg=mygrey!10!white}


% sidebar
% on the right
\useoutertheme[width=5\baselineskip,right]{sidebar}
% delete title and author
\makeatletter
\setbeamertemplate{sidebar right}{\insertverticalnavigation{\beamer@sidebarwidth}}
\makeatother
% fontsize
\setbeamerfont{section in sidebar}{size=\scriptsize}
\setbeamerfont{subsection in sidebar}{size=\scriptsize}
% margin
\setbeamersize{sidebar width right=3cm}
\setbeamersize{sidebar width left=2cm}


% item settings
\setbeamertemplate{itemize item}{$\color{main}\bullet$}
\setbeamertemplate{enumerate items}[square]
\setbeamertemplate{section in toc}[sections numbered]
\setbeamertemplate{subsection in toc}[square]


% color definition
%\definecolor{alizarin}{rgb}{0.82, 0.1, 0.26} % red
\definecolor{myblack}{rgb}{0.24, 0.17, 0.12}
\definecolor{mygrey}{rgb}{0.52, 0.52, 0.51}

\definecolor{berlin}{rgb}{0.64, 0, 0} % red
\colorlet{main}{berlin}
\colorlet{text}{myblack!100!white}
%% main candidates
%% 1
% \definecolor{DarkFern}{HTML}{407428} % green
% \colorlet{main}{DarkFern!100!white}
%% 2
% \definecolor{bluegreen}{rgb}{0.047 0.282 0.259} % green
% \colorlet{main}{bluegreen}
%% 3
% \definecolor{mybrown}{HTML}{967249} % brown
% \colorlet{main}{mybrown}

% set colors to elements
%% fg:    itself
%% bg:    background
%% !num!: gradient
\setbeamercolor{title}{fg=main}
\setbeamercolor{frametitle}{fg=main, bg=white}
\setbeamercolor{section in toc}{fg=text} 
\setbeamercolor{normal text}{fg=text}
\setbeamercolor{block title}{fg=main,bg=mygrey!14!white}
\setbeamercolor{block body}{fg=black,bg=mygrey!10!white}
\setbeamercolor{block body alerted}{bg=white}
\setbeamercolor{block title alerted}{fg=main,bg=white}
\setbeamercolor{alerted text}{fg=main}
\setbeamercolor{qed symbol}{fg=main} % proof end square
\setbeamercolor{math text}{fg=black}
\hypersetup{colorlinks,linkcolor=,urlcolor=main!80!white}