\documentclass[10pt,aspectratio=169,t]{beamer}
\usetheme[author,institute,date,title,page,hidelogo]{lines}
\usecolortheme{aptero}

\title[Lines beamer theme]{Lines}
\subtitle{a line-based theme for beamer}
\author[Benda]{Jan Benda}
\institute[T\"ubingen]{Neuroethology, University of T\"ubingen}
\date[2021]{March 2021}

\setbeamerfont{block body}{size=\small}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}

\begin{frame}[plain]
  \titlepage
\end{frame}

\begin{frame}[fragile]{Lines theme}
  \begin{block}{Include}
      \verb!\documentclass[aspectratio=169,t]{beamer}!\\
      \verb!\usetheme[author,date,title,page,hidelogo]{lines}!
  \end{block}
  Options select content of footline (defaults to \verb![author,page]!):
  \begin{itemize}
  \item \verb!author! / \verb!hideauthor!
  \item \verb!institute! / \verb!hideinstitute!
  \item \verb!date! / \verb!hidedate!
  \item \verb!title! / \verb!hidetitle!
  \item \verb!page! / \verb!hidepage!
  \item \verb!logo! / \verb!hidelogo!
  \end{itemize}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\section{Frames}

\begin{frame}[fragile]{Beamer frames}
  \begin{block}{Frame environment with title}
    \verb!\begin{frame}{The title of my slide}!\\
    \verb!  Some content.!\\
    \verb!\end{frame}!
  \end{block}
  \begin{block}{Alternative specification of frame title}
    \verb!\begin{frame}!\\
    \verb!  \frametitle{The title of my slide}!\\
    \verb!  Some content.!\\
    \verb!\end{frame}!
  \end{block}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\begin{frame}[fragile]{Frame title}
  \begin{block}{Title with logo}
    \verb!\setbeamertemplate{frametitle}[boxlinelogo]!
  \end{block}
  \begin{block}{Title without logo}
    \verb!\setbeamertemplate{frametitle}[boxline]!
  \end{block}
  \begin{block}{Color/Font}
    \verb!\setbeamercolor{frametitle}{fg=blue, bg=white}!\\
    \verb!\setbeamerfont{frametitle}{size=\LARGE}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Frame title line}
  \begin{block}{Thin line respecting page margins}
    \verb!\setbeamertemplate{frametitle line}[text][0.5pt]!
  \end{block}
  \begin{block}{Thick line}
    \verb!\setbeamertemplate{frametitle line}[text][3pt]!
  \end{block}
  \begin{block}{Line over full page}
    \verb!\setbeamertemplate{frametitle line}[page][1pt]!
  \end{block}
  \begin{block}{Color}
    \verb!\setbeamercolor{frametitle line}{fg=blue}!\\
    An empty foreground color hides the line:\\
    \verb!\setbeamercolor{frametitle line}{fg=}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Frame subtitle}
  \framesubtitle{Here we have a subtitle}
  \begin{block}{Frame environment with subtitle}
    \verb!\begin{frame}!\\
    \verb!  \frametitle{The title of my slide}!\\
    \verb!  \framesubtitle{This is a subtitle}!\\
    \verb!  Some content.!\\
    \verb!\end{frame}!
  \end{block}
  \begin{alertblock}{Try to avoid subtitles!}
    Keep the messages on your slides simple and clean.
  \end{alertblock}
  \begin{block}{Color/Font}
    \verb!\setbeamercolor{framesubtitle}{fg=blue}!\\
    \verb!\setbeamerfont{framesubtitle}{size=\large}!
  \end{block}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\begin{frame}[fragile]{Itemize and enumerate}
  \begin{minipage}[t]{0.45\textwidth}
    \vspace{-3ex}
    \begin{block}{Itemize with overlays}
      \verb!\begin{itemize}!\\
        \verb!\item Apple!\\
        \verb!\item<2-> Orange!\\
        \verb!\item<2-> Lemon!\\
        \verb!\item<3-> Banana!\\
        \verb!\end{itemize}!
    \end{block}
    \begin{itemize}
    \item Apple
    \item<2-> Orange
    \item<2-> Lemon
    \item<3-> Banana
    \end{itemize}
  \end{minipage}
  \hfill
  \begin{minipage}[t]{0.45\textwidth}
    \vspace{-3ex}
    \begin{block}{Enumerate with overlays}
      \verb!\begin{enumerate}!\\
        \verb!\item<2-> Apple!\\
        \verb!\item<1-> Orange!\\
        \verb!\item<2> Lemon!\\
        \verb!\item<3-> Banana!\\
        \verb!\end{enumerate}!
    \end{block}
    \begin{enumerate}
    \item<2-> Apple
    \item<1-> Orange
    \item<2> Lemon
    \item<3-> Banana
    \end{enumerate}
  \end{minipage}
\end{frame}

\begin{frame}[fragile]{Itemize and enumerate symbols}
  \begin{block}{Itemize and enumerate labels}
    \verb!\setbeamertemplate{itemize item}[arrow]!\\
    \verb!\setbeamertemplate{itemize subitem}[dash]!\\
    \verb!\setbeamertemplate{enumerate item}[arabic]!\\
    \verb!\setbeamertemplate{enumerate subitem}[alph]!
  \end{block}
  \begin{minipage}[t]{0.3\textwidth}
    One of
    \begin{itemize}
    \item \verb!default!
    \item \verb!circle!
    \item \verb!square!
    \item \verb!ball!
    \end{itemize}
  \end{minipage}
  \begin{minipage}[t]{0.3\textwidth}
    \verb!itemize! only:
    \begin{itemize}
    \item \verb!arrow!
    \item \verb!filledarrow!
    \item \verb!check!
    \item \verb!dash!
    \item \verb!triangle!
    \end{itemize}
  \end{minipage}
  \begin{minipage}[t]{0.3\textwidth}
    \verb!enumerate! only:
    \begin{itemize}
    \item \verb!alph!
    \item \verb!Alph!
    \item \verb!arabic!
    \item \verb!roman!
    \item \verb!Roman!
    \end{itemize}
  \end{minipage}
  \begin{block}{Color}
    \verb!\setbeamercolor{item}{fg=black, bg=white}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Nested itemize and enumerate}
  \begin{minipage}[t]{0.45\textwidth}
    \vspace{-3ex}
    \begin{block}{Itemize}
      \verb!\begin{itemize}!\\
      \verb!\item Apple!\\
      \verb!  \begin{itemize}!\\
      \verb!  \item Red!\\
      \verb!  \item Green!\\
      \verb!  \end{itemize}!\\
      \verb!\item Banana!\\
      \verb!\end{itemize}!
    \end{block}
    \begin{itemize}
    \item Apple
      \begin{itemize}
      \item Red
      \item Green
      \end{itemize}
    \item Banana
    \end{itemize}
  \end{minipage}
  \hfill
  \begin{minipage}[t]{0.45\textwidth}
    \vspace{-3ex}
    \begin{block}{Enumerate}
      \verb!\begin{enumerate}!\\
      \verb!\item Apple!\\
      \verb!  \begin{enumerate}!\\
      \verb!  \item Red!\\
      \verb!  \item Green!\\
      \verb!  \end{enumerate}!\\
      \verb!\item Banana!\\
      \verb!\end{enumerate}!
    \end{block}
    \begin{enumerate}
    \item Apple
      \begin{enumerate}
      \item Red
      \item Green
      \end{enumerate}
    \item Banana
    \end{enumerate}
  \end{minipage}
\end{frame}

\begin{frame}[fragile]{Itemize with action items}
  \begin{minipage}[t]{0.45\textwidth}
    \vspace{-2ex}
    \begin{block}{Itemize}
      \verb!\begin{itemize}!\\
        \verb!\item[\itemfilledarrow] Apple!\\
        \verb!\item<2-| alert@3> Orange!\\
        \verb!\item<2-| emph@2| uncheck@3-> Lemon!\\
        \verb!\item<3-| emph@1-> Banana!\\
        \verb!\item<3-| check@4> Mango!\\
        \verb!\item<4-| message@1-> Cherries!\\
        \verb!\item<4-> Grapes!\\
        \verb!\end{itemize}!
    \end{block}
  \end{minipage}
  \hfill
  \begin{minipage}[t]{0.45\textwidth}
    \begin{itemize}
    \item[\itemfilledarrow] Apple
    \item<2-| alert@3> Orange
    \item<2-| emph@2| uncheck@3-> Lemon
    \item<3-| emph@1-> Banana
    \item<3-| check@4> Mango
    \item<4-| message@1-> Cherries
    \item<4-> Grapes
    \end{itemize}
  \end{minipage}
  \begin{block}{Colors and fonts for message items}
    \verb!\setbeamercolor{message item}{fg=red}!\\
    \verb!\setbeamercolor{message item symbol}{fg=red}!\\
    \verb!\setbeamerfont{message item}{size=\large}!
  \end{block}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\begin{frame}[fragile]{Alert and structure}
  The \verb!\alert{}! command \alert{emphasizes} text.

  Structural \structure{emphasis} is provided by the \verb!\structure{}! command.

  \vspace{2ex}
  \begin{block}{Colors/Fonts}
    \verb!\setbeamercolor{alerted text}{fg=red}!\\
    \verb!\setbeamercolor{structure}{fg=blue}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Block environments with title}
  ... add structure and color to a slide --- use them with care:
  \begin{block}{Some block}
    Block with title and content\\
    \verb!\begin{block}{Some block}!\\
    \verb!  Block with title and content!\\
    \verb!\end{block}!
  \end{block}
  \begin{alertblock}{Careful!}
    \texttt{alertblock} environment with title as argument.
  \end{alertblock}
  \begin{exampleblock}{Example}
    \texttt{exampleblock} environment with title as argument.
  \end{exampleblock}
\end{frame}

\begin{frame}[fragile]{Block environments without title}
  ... add color to a slide in a more subtle way:
  \begin{block}{}
    Block with empty title.\\
    \verb!\begin{block}{}!\\
    \verb!  Block with empty title!\\
    \verb!\end{block}!
  \end{block}
  \begin{alertblock}{}
    \texttt{alertblock} with empty title.\\
    And just some text.
  \end{alertblock}
  \begin{exampleblock}{}
    \texttt{exampleblock} with empty title.\\
    And just some text.
  \end{exampleblock}
\end{frame}

\begin{frame}{Theorems --- for mathematicians}
  \begin{theorem}
    \texttt{theorem} environment.
  \end{theorem}
  \begin{definition}
    \texttt{definition} environment.\\[1ex]
    All theorem environments get the same color and font:
    \begin{itemize}
    \item \texttt{theorem title}
    \item \texttt{theorem body}
    \item \texttt{theorem line top/middle/bottom}
    \end{itemize}
  \end{definition}
  %\begin{example}
  %  \texttt{example} environment.
  %\end{example}
  \begin{proof}
    \texttt{proof} environment.\\
    Same colors and fonts as the \texttt{block} environment.
  \end{proof}
\end{frame}

\begin{frame}[fragile]{Message box}
  \begin{block}{A new (non-beamer) command for highlighting messages}
    \verb!\messagebox{Take home message}!
  \end{block}
  \vfill
  \messagebox{Take home message}
  \vfill
  Use it!
  \vfill
  \begin{block}{Colors/Fonts/Template}
    \verb!\setbeamertemplate{message}[lines]{1pt}{1pt} % width top/bottom line!\\
    \verb!\setbeamercolor{message}{fg=white, bg=red}!\\
    \verb!\setbeamercolor{message line top}{fg=orange}!\\
    \verb!\setbeamercolor{message line bottom}{fg=}!\\
    \verb!\setbeamertemplate{message symbol}[circle]   % default, circle, arrow!\\
    \verb!\setbeamercolor{message symbol}{fg=white}!
  \end{block}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\begin{frame}[fragile]{Quotations}
  Quote something of somebody with indentation:
  \begin{quotation}[Me And Myself]
    A \verb!quotation! environment. There is a lot to talk about and
    it really takes a lot of words to express this. Most likely this
    does not fit into a single line. We might even need yet another
    full new line.
    
    Here we even start a second paragraph.
  \end{quotation}
  \vfill
  Quote something else of somebody else (empty source argument):
  \begin{quote}
    A \verb!quote! environment.

    With a second line.
  \end{quote}
  \vfill
  Here is a poem:
  \begin{verse}
    A \verb!verse! environment ---\\with a second line.
  \end{verse}
\end{frame}

\newcommand{\quotedemo}{
  \begin{quote}[Me and Myself]
    A major insight.
  \end{quote}
  \vfill
}

\newcommand{\quotesymboldemo}[1]{
  \setbeamertemplate{quote symbol}[#1]
  \begin{small}
    \texttt{\textbackslash setbeamertemplate\{quote symbol\}[#1]}
  \end{small}
  \quotedemo
  \setbeamertemplate{quote symbol}[closequote]
}

\newcommand{\quotesymbolfontdemo}[1]{
  \setbeamerfont{quote symbol}{family*=#1}
  \begin{small}
    \texttt{\textbackslash setbeamerfont\{quote symbol\}\{family*=#1\}}
  \end{small}
  \quotedemo
  \setbeamerfont{quote symbol}{family*=pbk}
}

\begin{frame}[fragile]{Quote symbol settings}
  \quotesymboldemo{default}
  \quotesymboldemo{openquote}
  \quotesymboldemo{closequote}
  \quotesymbolfontdemo{phv}
  \quotesymbolfontdemo{pnc}
  \quotesymbolfontdemo{qcs}
\end{frame}

\newcommand{\quotesourcedemo}[1]{
  \setbeamertemplate{quote source}[#1]
  \begin{small}
    \texttt{\textbackslash setbeamertemplate\{quote source\}[#1]}
  \end{small}
  \quotedemo
}

\begin{frame}[fragile]{Source settings for quote and quotation environments}
  Do not print the source:\\
  \quotesourcedemo{default}
  Left aligned in a new line:\\
  \quotesourcedemo{left}
  \quotesourcedemo{leftbrackets}
  \begin{alertblock}{}
    In the template names, replace \texttt{quote} by
    \texttt{quotation} to apply the same changes to the
    \texttt{quotation} environment.
  \end{alertblock}
\end{frame}

\begin{frame}[fragile]{Source settings for quote and quotation environments}
  Right aligned in a new line:
  \vfill
  \quotesourcedemo{right}
  \quotesourcedemo{rightbrackets}
  \quotesourcedemo{dashright}
  \quotesourcedemo{tilderight}
\end{frame}

\begin{frame}[fragile]{Source settings for quote and quotation environments}
  Right aligned in the last line:
  \vfill
  \quotesourcedemo{rightline}
  \quotesourcedemo{rightlinebrackets}
  \quotesourcedemo{dashrightline}
  \quotesourcedemo{tilderightline}
\end{frame}

\newcommand{\quotecolordemo}[2]{
  \setbeamercolor{quote line top}{fg=#1}
  \setbeamercolor{quote line bottom}{fg=#2}
  \begin{small}
    \texttt{\textbackslash setbeamercolor\{quote line top\}\{fg=#1\}}\\
    \texttt{\textbackslash setbeamercolor\{quote line bottom\}\{fg=#2\}}
  \end{small}
  \quotedemo
}

\begin{frame}[fragile]{Line settings for quote and quotation environments}
  \setbeamertemplate{quote begin}[lines][2pt]
  \setbeamertemplate{quote end}[lines][2pt]
  \begin{small}
    \verb!\setbeamertemplate{quote begin}[lines][2pt]!
    \verb!\setbeamertemplate{quote end}[lines][2pt]!
  \end{small}
  \vfill
  \quotecolordemo{}{}
  \quotecolordemo{blue}{}
  \quotecolordemo{}{blue}
  \quotecolordemo{red}{blue}
\end{frame}

\setbeamertemplate{quote begin}[lines][0.5pt]
\setbeamertemplate{quote end}[lines][0.5pt]
\setbeamercolor{quote line top}{fg=}
\setbeamercolor{quote line bottom}{fg=}

\newcommand{\quoteboxdemo}[2]{
  \setbeamercolor{quote}{fg=#1, bg=#2}
  \begin{small}
    \texttt{\textbackslash setbeamercolor\{quote\}\{fg=#1, bg=#2\}}\\
  \end{small}
  \quotedemo
}

\begin{frame}[fragile]{Colors and fonts for quote and quotation environments}
  \setbeamerfont{quote}{size=\tiny, shape=\upshape}
  {\small \verb!\setbeamerfont{quote}{size=\tiny, shape=\upshape}!\\}
  \quotedemo
  \setbeamerfont{quote}{size=\normalsize, shape=\slshape}
  \quoteboxdemo{blue}{}
  \quoteboxdemo{red}{black!15}
  \setbeamercolor{quote}{fg=normal text.fg, bg=black!15}
  \setbeamercolor{quote symbol}{fg=green}
  {\small \verb!\setbeamercolor{quote symbol}{fg=green}!\\}
  \quotedemo
  \setbeamercolor{quote symbol}{fg=red}
  \setbeamercolor{quote source}{fg=blue}
  {\small \verb!\setbeamercolor{quote source}{fg=blue}!\\}
  \quotedemo
  \setbeamerfont{quote source}{size=\tiny}
  {\small \verb!\setbeamerfont{quote source}{size=\tiny}!\\}
  \quotedemo
  \setbeamercolor{quote source}{fg=}
\end{frame}
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\newcommand{\colorpatch}[1]{%
  \parbox{10ex}{\centerline{\strut#1}\textcolor{#1}{\rule{10ex}{10ex}}}
  \quad}

\begin{frame}{Colors of the aptero theme}
  \vspace{1ex}
  \colorpatch{red}
  \colorpatch{orange}
  \colorpatch{yellow}
  \colorpatch{lightgreen}
  \colorpatch{green}

  \vspace{1ex}
  \colorpatch{darkgreen}
  \colorpatch{cyan}
  \colorpatch{lightblue}
  \colorpatch{blue}
  \colorpatch{purple}

  \vspace{1ex}
  \colorpatch{magenta}
  \colorpatch{pink}
  \colorpatch{white}
  \colorpatch{gray}
  \colorpatch{black}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\begin{frame}[fragile]{Footline}
  \begin{block}{no footline}
    \verb!\setbeamertemplate{footline}[default]!
  \end{block}
  \begin{block}{lines theme with author, title, etc. on the left}
    \verb!\setbeamertemplate{footline}[linesleft]!
  \end{block}
  \begin{block}{lines theme with author, title, etc. on the right}
    \verb!\setbeamertemplate{footline}[linesright]!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Footline line}
  \begin{block}{Thin line respecting page margins}
    \verb!\setbeamertemplate{footline line}[text][0.5pt]!
  \end{block}
  \begin{block}{Thick line}
    \verb!\setbeamertemplate{footline line}[text][3pt]!
  \end{block}
  \begin{block}{Line over full page}
    \verb!\setbeamertemplate{footline line}[page][1pt]!
  \end{block}
  \begin{block}{Color}
    \verb!\setbeamercolor{footline line}{fg=black}!
    An empty foreground color hides the line:\\
    \verb!\setbeamercolor{footline line}{fg=}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Footline separator}
  \begin{block}{Vertical line}
    \verb!\setbeamertemplate{footline separator}[text][0.5pt]!
  \end{block}
  \begin{block}{Full height vertical line}
    \verb!\setbeamertemplate{footline separator}[full][0.5pt]!
  \end{block}
  \begin{block}{em dash}
    \verb!\setbeamertemplate{footline separator}[dash]!
  \end{block}
  \begin{block}{Just space}
    \verb!\setbeamertemplate{footline separator}[space]!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Footline page}
  How the page in the footline is displayed can be controlled in the
  following way:
  \begin{block}{frame number, e.g. 12}
    \verb!\setbeamertemplate{page number in head/foot}[frames]!
  \end{block}
  \begin{block}{frame number with total number of frames, e.g. 12 / 20}
    \verb!\setbeamertemplate{page number in head/foot}[framestotal]!
  \end{block}
  \begin{block}{frame number with slide number, e.g. 12 -- 3}
    \verb!\setbeamertemplate{page number in head/foot}[slides]!
  \end{block}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
\section{Title page}

\begin{frame}[fragile]{Title page templates}
  \begin{block}{Title page frame}
    \verb!\begin{frame}[plain]!\\
    \verb!  \titlepage!\\
    \verb!\end{frame}!
  \end{block}
  \vspace{2ex}
  \begin{block}{Flushed left}
    \verb!\setbeamertemplate{title page}[leftlines]!
  \end{block}
  \begin{block}{Centered}
    \verb!\setbeamertemplate{title page}[centerlines]!
  \end{block}
\end{frame}

\begin{frame}[fragile,c]{Title page content}
  From top to bottom:
  \begin{enumerate}
  \item Logo images with a frametitle line below
  \item Title graphic images with a line directly below
  \item Title and subtitle with a line below
  \item Authors
  \item Institutions and date
  \end{enumerate}
\end{frame}

\begin{frame}[fragile]{Title page logo}
  \begin{block}{In preamble --- can be more than a single image!}
    \verb!\titlelogo{\includegraphics[height=6ex]{ourlogo}}!
  \end{block}
  Separate them with the \verb!\hspace{0.1\textwidth}! or \verb!\hfill! commands.
  \vspace{2ex}
  \begin{block}{Line below logo is the same as for frame titles}
    \verb!\setbeamertemplate{frametitle line}[text][0.5pt]!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Title page graphic}
  \begin{block}{In preamble --- can be more than a single image!}
    \verb!\titlegraphic{\includegraphics[width=\textwidth]{amazingimage}}!
  \end{block}
  Separate them with the \verb!\hspace{0.1\textwidth}! or \verb!\hfill! commands.
  \vspace{2ex}
  \begin{block}{Line below title graphic}
    \verb!\setbeamertemplate{title page graphic line}[default][1.5ex]!
  \end{block}
  \begin{block}{Color}
    \verb!\setbeamercolor{title page graphic line}{fg=red}!\\
    Empty foreground color hides line:\\
    \verb!\setbeamercolor{title page graphic line}{fg=}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Title page title and subtitle}
  \begin{block}{In preamble}
    \verb!\title{The titel of my talk}!\\
    \verb!\subtitle{and whatever}!\\
  \end{block}
  \begin{block}{Color/Font}
    \verb!\setbeamercolor{title}{fg=black}!
  \end{block}
  \begin{block}{Line below title and subtitle}
    \verb!\setbeamertemplate{title page title line}[default][0.2ex]!
  \end{block}
  \begin{block}{Color}
    \verb!\setbeamercolor{title page title line}{fg=red}!\\
    Empty foreground color hides line:\\
    \verb!\setbeamercolor{title page title line}{fg=}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Title page authors}
  \begin{block}{In preamble}
    \strut\verb!\author{Mary Hagedorn\inst{1} \and Walter Heiligenberg\inst{2}}!
  \end{block}
  \begin{block}{Author separator}
    \verb!\setbeamertemplate{title page author and}[line]!
  \end{block}
  One of
  \begin{itemize}
  \item \verb!space!
  \item \verb!comma!
  \item \verb!line! (a vertical line)
  \item \verb!and!  (an '\&')
  \end{itemize}
  \begin{block}{Color/Font}
    \verb!\setbeamercolor{author}{fg=black}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Title page institutes}
  \begin{block}{In preamble}
    \strut\verb!\institute{\inst{1}Somewhere \and \inst{2}Somewhere else}!
  \end{block}
  \begin{block}{Institutes separator}
    \verb!\setbeamertemplate{title page institute and}[line]!
  \end{block}
  One of
  \begin{itemize}
  \item \verb!default! (a linebreak)
  \item \verb!space!
  \item \verb!comma!
  \item \verb!line! (a vertical line)
  \end{itemize}
  \begin{block}{Color/Font}
    \verb!\setbeamercolor{institute}{fg=black}!
  \end{block}
\end{frame}

\begin{frame}[fragile]{Title page date}
  \begin{block}{In preamble}
    \strut\verb!\date[2020]{ICN 2020}!
  \end{block}
  \begin{block}{Font}
    \verb!\setbeamerfont{date}{size=\normalsize}!
  \end{block}
  \begin{block}{Color}
    Same as for institutes.
  \end{block}
\end{frame}

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\section{Sectioning pages}

\subsection{Section page}

\frame[plain]{\subsectionpage}

\begin{frame}[fragile]{Section page}
  Section commands between the frames, like
  \begin{block}{}
    \verb!\section{A new section}!
  \end{block}
  automaticallly create a special frame with section number and title.

  \begin{block}{No automatic section pages}
    \verb!\AtBeginSection{}  % in preamble!
  \end{block}
  \begin{block}{Manual insertion of a section page}
    \verb!\frame[plain]{\sectionpage}!
  \end{block}
  \begin{block}{Colors/Fonts}
    \verb!\setbeamercolor{section name}{parent={titlelike}}!
    \verb!\setbeamercolor{section name separator}{parent={section name}}!
    \verb!\setbeamercolor{section title}{parent={titlelike}}!
  \end{block}
\end{frame}

\subsection{Subsection page}

\frame[plain]{\subsectionpage}

\begin{frame}[fragile]{Subsection pages}
  After a subsection command\\
  \begin{block}{}
    \verb!\subsection{A new subsection}!
  \end{block}
  you may want to insert a subsection page displaying the current
  section and subsection numbers and titles:
  \begin{block}{Subsection page}
    \verb!\frame[plain]{\subsectionpage}!
  \end{block}
  \vfill
  \begin{block}{Colors/Fonts}
    \verb!\setbeamercolor{subsection name}{parent={titlelike}}!
    \verb!\setbeamercolor{subsection name separator}{parent={section name}}!
    \verb!\setbeamercolor{subsection title}{parent={titlelike}}!
  \end{block}
\end{frame}

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\section{Further reading}

\begin{frame}{Beamer user guide}
  Read the beamer user guide at
  \begin{block}{}
    \url{http://ftp.rrzn.uni-hannover.de/pub/mirror/tex-archive/macros/latex/contrib/beamer/doc/beameruserguide.pdf}
  \end{block}
  
  \vfill
  In particular
  \begin{itemize}
  \item the tutorial (section 3)
  \item the ``guidelines for creating presentations'' (section 5) --- quite nice and independent of beamer!
  \item ``creating overlays'' (section 9)
  \item section 11 for some fancy features (hyperlinks and zooming)
  \item ``local structure'' (section 12) for more infos on lists and blocks, etc.
  \end{itemize}
\end{frame}

\begin{frame}{Beamer templates}
  \begin{alertblock}{}
    Templates are a powerful method of beamer that allow you to modify
    the appearance of your presentation.
  \end{alertblock}
  \vfill
  Read in the beamer user guide
  \begin{itemize}
  \item section 16.3 ``Changing the Templates Used for Different Elements of a Presentation''
  \end{itemize}

  \vfill
  You find a nice summary of common beamer template/color/font names in the
  \begin{block}{Beamer appearance cheat sheet}
    \url{http://www.cpt.univ-mrs.fr/~masson/latex/Beamer-appearance-cheat-sheet.pdf}
  \end{block}
\end{frame}

\end{document}
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