I would like to reduce the height of my footer in beamer. I tried \setbeamerfont{footline}{size=\fontsize{0}{0}\selectfont} but at one point, this doesn't reduce the height anymore. Also, it would be nice if the text in the footer would vertically align with the slide title. Here my code.
\documentclass{beamer}
\usetheme{metropolis}
\setbeamertemplate{frame numbering}[fraction]
\title{My Title}
\subtitle{My Subtitle}
\author{My Name}
\date{}
\institute{Reference}
\setbeamertemplate{frame footer}{\insertauthor\hfill\insertsubtitle}
\setbeamerfont{footline}{size=\fontsize{0}{0}\selectfont}
\setbeamerfont{page number in head/foot}{size=\tiny}
\setbeamercolor{footline}{fg=white,bg=black}
\setbeamercolor{frametitle}{fg=white,bg=black}
\begin{document}
\begin{frame}
\titlepage\thispagestyle{empty}
\end{frame}
\begin{frame}[t]{Contents}\vspace{3pt}
\begin{enumerate}
\item First Point
\item Second Point
\item ...
\end{enumerate}
\end{frame}
\end{document}
