\documentclass[presentation, smaller, aspectratio=169]{beamer}
\usetheme{Singapore}
\usecolortheme{rose}

\date{\today}

\usepackage[ngerman]{babel}
% only use with pdflatex, don't use with xelatex
%\usepackage[T1]{fontenc}
%\usepackage[utf8]{inputenc}

\usepackage{mathtools}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{hyphenat}
\usepackage{tikz}
\usepackage{graphicx}
\usepackage{color}
\usepackage{proof}

%%% show subsection title frames
\AtBeginPart{
\let\insertpartnumber\relax
\let\partname\relax
\begin{frame}[tocframe]
\partpage
\end{frame}
}
\AtBeginSection{
\let\insertsectionnumber\relax
\let\sectionname\relax
\begin{frame}[tocframe]
\sectionpage
\end{frame}
}
\AtBeginSubsection{
\let\insertsubsectionnumber\relax
\let\subsectionname\relax
\begin{frame}[tocframe]
\subsectionpage
\end{frame}
}

%%% source code
\usepackage{listings}
\usepackage{minted}
\definecolor{bg}{rgb}{0.95, 0.95, 1.0}

%%% define own enumeration styles
% use custom labels with `\begin{enumerate}[label=$\bullet$]`
\usepackage{enumerate}
\usepackage{enumitem}
\setlist{nosep}
\setlist[enumerate, 1]{label=$\bullet$}
\setlist[enumerate, 2]{label=$\bullet$}
\setlist[enumerate, 3]{label=$\bullet$}

% page numbers in the bottom right
\addtobeamertemplate{navigation symbols}{}{%
    \usebeamerfont{footline}%
    \usebeamercolor[fg]{footline}%
    \hspace{1em}%
    \raisebox{2pt}[0pt][0pt]{\insertframenumber/\inserttotalframenumber}
}