BeamerTemplate

\documentclass[12pt, aspectratio=169, handout]{beamer}

\usetheme[sectionpage=none]{metropolis}
\setbeamercolor{background canvas}{bg=white}
\setbeamercolor{frametitle}{fg=black, bg=white}
\setbeamercolor{progress bar}{fg=black, bg=lightgray}
\setbeamercolor*{normal text}{fg=black}

\makeatletter
\setbeamertemplate{headline}{%
  \begin{beamercolorbox}[colsep=1.5pt]{upper separation line head}
  \end{beamercolorbox}
  \begin{beamercolorbox}{section in head/foot}
    \vskip2pt\insertnavigation{\paperwidth}\vskip2pt
  \end{beamercolorbox}%
  \begin{beamercolorbox}[colsep=1.5pt]{lower separation line head}
  \end{beamercolorbox}
}
\makeatother

% Reduce frame title box height (the one in \begin{frame}{<frame-title>}
\setbeamertemplate{frametitle}{%
    \nointerlineskip%
    \begin{beamercolorbox}[wd=\paperwidth,ht=1.8ex,dp=0.6ex]{frametitle}
        \hspace*{1ex}\insertframetitle%
    \end{beamercolorbox}%
}

\makeatletter
\setlength{\metropolis@titleseparator@linewidth}{3pt}
% \setlength{\metropolis@progressonsectionpage@linewidth}{2pt}
% \setlength{\metropolis@progressinheadfoot@linewidth}{2pt}
\makeatother

% Reduce entire frame fontsize using \begin{framefont}{\tiny} \begin{frame} .....
% https://tex.stackexchange.com/a/401409
\usepackage{environ}
\newcommand{\customframefont}[1]{
\setbeamertemplate{itemize/enumerate body begin}{#1}
\setbeamertemplate{itemize/enumerate subbody begin}{#1}
}

\NewEnviron{framefont}[1]{
\customframefont{#1} % for itemize/enumerate
{#1 % For the text outside itemize/enumerate
\BODY
}
\customframefont{\normalsize}
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Text
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[scaled]{helvet}
\renewcommand\familydefault{\sfdefault} 
\usepackage[T1]{fontenc}

% For \cfbox which colors text and draws a colored border
% eg \cfbox{<border-color>}{<text-color>}{text}
\newcommand{\cfbox}[2]{%
	\colorlet{currentcolor}{.}%
	{\color{#1}%
		\fbox{\color{currentcolor}#2}}%
}
\usepackage[12pt]{moresize}
\usepackage{hyperref}

\hypersetup{
    colorlinks,
    citecolor=gray,
    linkcolor=black
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Lists
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{xcolor}
\definecolor{lucasdarkblue}{rgb}{0.0, 0.0, 0.2}
\definecolor{lucasdarkblue2}{rgb}{0.0, 0.0, 0.4}
\definecolor{lucasgreen}{rgb}{0.0, 0.9, 0.3}
\definecolor{lucaslightblue}{rgb}{0.0, 0.2, 0.8}
\definecolor{lucasteal}{rgb}{0.18,.31,.31}
\definecolor{blue}{RGB}{24,71,77}

% Itemize symbols
 \setbeamertemplate{itemize item}{\color{lucasteal}$\blacktriangleright$}
 \setbeamertemplate{itemize subitem}{\color{lucasteal}$\bullet$}

 % Smaller fontsize for first level
\setbeamertemplate{itemize/enumerate body begin}{\small}
% Even smaller fontsizes for sublevels
\setbeamertemplate{itemize/enumerate subbody begin}{\scriptsize}


\newenvironment{wideitemize}{\itemize\addtolength{\itemsep}{10pt}}{\enditemize}
\newenvironment{wideenumerate}{\enumerate\addtolength{\itemsep}{10pt}}{\endenumerate}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Tables
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{booktabs}
\usepackage{adjustbox}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Other float stuff
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{graphicx}
\usepackage{subcaption}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Math
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{amsmath}
\usepackage{bm} % for \boldsymbol{}
\usepackage{dsfont}
\usepackage{amsmath,ragged2e}

% \bigbrace{<eqn>}{<text-annotation>}
% \bigoverbrace{<eqn>}{<text-annotation>}
\newlength\mylen
\newcommand\bigbrace[2]{%
	\settowidth\mylen{$\displaystyle #1$}
	\underbrace{#1}_{\parbox{\mylen}{\scriptsize\Centering #2}}}
\newcommand\bigoverbrace[2]{%
	\settowidth\mylen{$\displaystyle #1$}
	\overbrace{#1}^{\parbox{\mylen}{\scriptsize\Centering #2}}}

% https://tex.stackexchange.com/a/205623
% For uncovering braces in equations. eg: \uncoverubrace<2->{u}{is utility}
\newcommand<>{\uncoverubrace}[2]{%
  \onslide#3 \underbrace{ \onslide<1->%
  #1%
  \onslide#3 }_{#2} \onslide<1->%
}
\newcommand<>{\uncoverobrace}[2]{%
  \onslide#3 \overbrace{ \onslide<1->%
  #1%
  \onslide#3 }^{#2} \onslide<1->%
}
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Referencing stuff
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{natbib}
\setcitestyle{aysep={}} 

% Permanently make citations smaller
%https://latex.org/forum/viewtopic.php?t=25101
\let\realcitep\citep
\renewcommand*{\citep}[1]{{\scriptsize\realcitep{#1}}}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Custom macros for convenience
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Title & author
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\title{Title}
\subtitle{Subtitle}
% \date{\today}
\date{}
\author{AuthorA \and AuthorB \and }
\institute{Institute}

% For example (to be commented out)
\usepackage{blindtext}
\usepackage{lipsum}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Init doc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\maketitle

\input{./tex/dummy-text.tex}


\end{document}