Beamer presentation template — clean 16:9 slides

\documentclass[11pt,aspectratio=169]{beamer}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{amsmath, amssymb}

\usetheme{default}
\usecolortheme{seahorse}

\setbeamercolor{frametitle}{bg=structure.fg, fg=white}
\setbeamerfont{frametitle}{size=\large, series=\bfseries}
\setbeamertemplate{navigation symbols}{}

\title{Title of Your Talk}
\subtitle{An Optional Subtitle}
\author{Author Name}
\institute{University / Company}
\date{\today}

\begin{document}

\begin{frame}
  \titlepage
\end{frame}

\begin{frame}{Outline}
  \tableofcontents
\end{frame}

\section{Introduction}

\begin{frame}{Motivation}
  \begin{itemize}
    \item First key point you want to make
    \item Second key point with \emph{emphasis}
    \item Third point — with a citation~\cite{example2024}
  \end{itemize}
\end{frame}

\section{Main Content}

\begin{frame}{A Theorem}
  \begin{block}{Theorem (Pythagoras)}
    For a right triangle with legs $a$, $b$ and hypotenuse $c$:
    \[
      a^2 + b^2 = c^2
    \]
  \end{block}
  \begin{alertblock}{Caveat}
    Only valid in Euclidean geometry.
  \end{alertblock}
\end{frame}

\section{Conclusion}

\begin{frame}{Take-aways}
  \begin{enumerate}
    \item Summary point 1
    \item Summary point 2
    \item Future work
  \end{enumerate}
  \vspace{1em}
  \centering\Large Thank you!
\end{frame}

\end{document}