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]{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 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}[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}{c|c}
\hline
\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}| \\
\hline
\end{tabular}
\end{table}
\end{frame}
\begin{frame}{List Examples}{And a Subtitle Example as Bonus}
\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}
\end{column}%
\begin{column}{.5\textwidth}%
\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}%
\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]
print('Hello world!') # An example of Hello World in Python
\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}
% \appendix
% \begin{frame}[allowframebreaks]{References}
% \printbibliography
% \end{frame}
\end{document}