This Beamer theme most accurately reflects Leiden University's new house style (https://huisstijl.universiteitleiden.nl/templates), and makes it ready-to-use with LaTeX, right here on Overleaf!
\begin
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%% example.tex
%% Copyright 2023- J.P. van Leenen
%%
%% LPPL 1.3c+
\documentclass[aspectratio=169, 10pt]{beamer}
% Options:
% - noslidenumbering (no options), disables slide numbering
% - style=[archaeology, fgga, humanities, law, medicine, science, social], changes accent colour to match faculty
\usetheme[
% % e.g.
% noslidenumbering,
% style=science,
]{lu}
% Set text in the left-corner of the footer, comment to disable.
\setlufootleft{Van Leenen --- Leiden University is Great}
\usepackage{appendixnumberbeamer}
\graphicspath{{graphics/}}
\title{What Makes Leiden University\\Great}
\author{A Template by Jort van Leenen}
\institute{Based on the Official PowerPoint}
\begin{document}
\begin{frame}[plain]
\titlepage
\end{frame}
\begin{frame}{Some Block and Styling Examples}
\begin{definition}
\textbf{Leiden University} is the \emph{oldest} Dutch institution of higher education.
\end{definition}
\begin{alertblock}{Housing}
Start searching for a place to stay \alert{as soon as possible}!
\end{alertblock}
\begin{exampleblock}{Open}
Everyone is welcome!
\end{exampleblock}
\end{frame}
\begin{frame}{Some Math}
\textbf{Claim:} there exists an infinite amount of prime numbers
\begin{proof}[Proof by Contradiction]
Assume that the number of primes is finite, and that all such numbers are on a list: \(p_1, p_2, \dots, p_n\)
\smallskip
Consider the number
\[N = p_1 \cdot p_2 \cdot \ldots \cdot p_n + 1\]
For any $i \in \{1, \dots, n\}$, if we divide $N$ by $p_i$, we obtain remainder $1$. Hence no prime $p_i$ on our list divides $N$. Therefore, either $N$ itself is prime, or it has a prime factor not in our original list.
\smallskip
Thus, our assumption must be false, and there must exist infinitely many prime numbers.
\end{proof}
\end{frame}
\begin{frame}[fragile]{\texttt{\textbackslash accent} Usage}
\texttt{\textbackslash accent} behaves exactly like \texttt{\textbackslash alert}. However, one of the theme's colours can be specified as an option to allow for easy highlighting.
\begin{table}
\centering
\begin{tabular}{l|l}
\toprule
\textbf{Visual} & \textbf{Command} \\
\midrule
\accent{highlighted} & \verb|\accent{highlighted}| \\
\accent[lightblue]{highlighted} & \verb|\accent[lightblue]{highlighted}| \\
\accent[midblue]{highlighted} & \verb|\accent[midblue]{highlighted}| \\
\accent[darkblue]{highlighted} & \verb|\accent[darkblue]{highlighted}| \\
\accent[red]{highlighted} & \verb|\accent[red]{highlighted}| \\
\accent[lightgreen]{highlighted} & \verb|\accent[lightgreen]{highlighted}| \\
\accent[darkgreen]{highlighted} & \verb|\accent[darkgreen]{highlighted}| \\
\accent[turquoise]{highlighted} & \verb|accent[turquoise]{highlighted}| \\
\accent[violet]{highlighted} & \verb|\accent[violet]{highlighted}| \\
\bottomrule
\end{tabular}
\end{table}
\end{frame}
\begin{frame}{Two Columns}{List Examples, a Figure, and a Subtitle}
\begin{columns}[onlytextwidth]%
\begin{column}{.5\textwidth}%
\textbf{Itemize}
\begin{itemize}
\item This is the first item.
\item This is the second item.
\begin{itemize}
\item This is the first subitem.
\begin{itemize}
\item This is the first subsubitem.
\end{itemize}
\end{itemize}
\end{itemize}
\textbf{Enumerate}
\begin{enumerate}
\item This is the first item.
\item This is the second item.
\begin{enumerate}
\item This is the first subitem.
\begin{enumerate}
\item This is the first subsubitem.
\end{enumerate}
\end{enumerate}
\end{enumerate}
\end{column}%
\begin{column}{.5\textwidth}%
\begin{figure}
\centering
\includegraphics[width=0.75\linewidth]{graphics/corner-logo.png}
\caption{Leiden University's Logo}
\label{fig:lu-logo}
\end{figure}
\end{column}%
\end{columns}%
\end{frame}
\begin{frame}[fragile]{Listings Template}
Various styles have been provided with this theme for external tools. See the \texttt{styles} folder for external library and application styles. LaTeX-related styles have been added to \texttt{beamerthemelu.sty}. As an example, take the following code listing to which the Listings style \texttt{lu} has been applied.
\begin{lstlisting}[language=python, style=lu]
"""A small code example in Python"""
def sayHi(who: str) -> None:
print(f'Hi {who}!')
sayHi('Jort')
\end{lstlisting}
\end{frame}
\begin{frame}[c, standout]{Standout}
This template reverses the colour usage. It could, for example, be used to review or recap information or draw special attention to a particular aspect.
\end{frame}
\begin{frame}[plain]
\Closure
{Thank you}{Questions?}
\end{frame}
% To add references, uncomment below, and be sure to set your reference file.
% \appendix
% \begin{frame}[allowframebreaks]{References}
% \printbibliography
% \end{frame}
\end{document}