\documentclass[xcolor=table,aspectratio=169]{beamer}

% General settings
\usetheme{Madrid}
\usepackage[T1]{fontenc}
\usepackage{graphicx}

% Remove navigation symbols
\beamertemplatenavigationsymbolsempty

% Fonts
\usepackage{helvet}
\setbeamerfont{normal text}{family=helvet}
\setbeamerfont{local structure}{family=helvet}

% Colors
\definecolor{kgrey}{HTML}{2b2828}
\setbeamercolor{frametitle}{bg=kgrey,fg=white}
\setbeamercolor{block title}{bg=kgrey,fg=white}

% Lists
\setbeamertemplate{enumerate items}[default]
\setbeamertemplate{itemize items}{\normalsize $\bullet$}
\setbeamercolor{description item}{fg=kgrey}
\setbeamercolor{enumerate item}{fg=kgrey}
\setbeamercolor{itemize item}{fg=kgrey}
\setbeamercolor{itemize subitem}{fg=kgrey}
\setbeamercolor{itemize subsubitem}{fg=kgrey}

% Templates
\setbeamertemplate{blocks}[default]
\setbeamertemplate{frametitle}{}
\setbeamertemplate{footline}{}
\usepackage{tcolorbox}
\tcbuselibrary{skins,hooks}
\tcbset{colframe=structure,fonttitle=\bfseries,beamer, clip upper, boxsep=0pt, sharp corners=all, no shadow, left skip=0pt, right skip=0pt, coltext=white}
\setbeamertemplate{title page}
{
  \leavevmode%
  \vbox{%
  \vspace{-1.6ex}%
  \noindent\begin{tcolorbox}[enhanced,watermark graphics=photo.png, width=\paperwidth, height=0.575\paperwidth, watermark zoom=1.25, grow to left by=0.035\paperwidth, frame hidden]

  \vspace{7.5em}
  \begin{center} 
  \huge
  \textbf{\inserttitle}

  \end{center}
  \end{tcolorbox}

  \vspace{-2em}
  \begin{tcolorbox}[width=\paperwidth, enhanced, colback=kgrey, grow to left by=0.035\paperwidth,]
  \begin{center}
  \footnotesize \bf \insertauthor\quad | \quad \insertdate    
  \end{center}
  \end{tcolorbox}
  }
}
