LaTeX Beamer Template.

BeamerTemplate.tex

\documentclass[aspectratio=169]{beamer}
\usepackage[italian]{babel} 
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage{xcolor}
\usepackage{amsmath,amssymb,lmodern}
\usetheme{AnnArbor}
\usepackage{animate}

% in way to comment a block
\long\def\/*#1*/{}

\makeatletter

\setbeamercolor*{author in head/foot}{parent=palette tertiary}
\setbeamercolor*{title in head/foot}{parent=palette primary}
\setbeamercolor*{date in head/foot}{parent=palette primary}

\setbeamercolor*{section in head/foot}{parent=palette tertiary}
\setbeamercolor*{subsection in head/foot}{parent=palette primary}
% colors for the external link field
\setbeamercolor*{LinkToIndex}{parent=palette tertiary}

\defbeamertemplate*{footline}{}
{
	\leavevmode%
	\hbox{%
		\begin{beamercolorbox}[wd=.25\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
			\usebeamerfont{author in head/foot}
		\end{beamercolorbox}%
	
		\begin{beamercolorbox}[wd=.25\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}
		\end{beamercolorbox}%
	
	% this is a new field with an external link
	\begin{beamercolorbox}[wd=.25\paperwidth,ht=2.25ex,dp=1ex,center]{LinkToIndex}%
		\usebeamerfont{author in head/foot}\hyperlink{index}{Index}\hspace*{2ex}
	\end{beamercolorbox}%

		\begin{beamercolorbox}[wd=.25\paperwidth,ht=2.25ex,dp=1ex,center]{date in head/foot}%
			\usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
			\insertframenumber{} / \inserttotalframenumber 
		\end{beamercolorbox}}%
		
	\vskip0pt%
}
\setbeamersize{text margin left=1em,text margin right=1em}
\makeatother

\title{TITLE} 
\author{AUTHOR} 
\date{}

\institute{INSTITUDE} 
\logo{\includegraphics[width=15mm]{Imgs/Uni}}

\setbeamercovered{dynamic}

\begin{document}
	
	% Cover Page
	\begin{frame} 
		\maketitle 		
	\end{frame}
  
  \addtocontents{toc}{\protect\setcounter{tocdepth}{0}}
\section{Index}
\begin{frame}[label = index]
	%\index{generate}
	\tableofcontents
\end{frame}

\end{document}