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\usepackage[utf8]{inputenc}

\usepackage{pgfpages}

\setbeameroption{show notes on second screen=right}
\usetheme[progressbar=frametitle]{metropolis}
% \usepackage{appendixnumberbeamer}
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\setbeamertemplate{caption}[default]

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\resetcolor
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\usepackage{color}

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\usepackage{amsmath}
\usepackage{amsfonts}

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\usepackage{forest}
\usepackage{tikz-cd}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% absolute positioning of typeset material
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% https://tex.stackexchange.com/questions/311007/change-package-option-overlay-from-textpos-package-in-document/311031#311031
\newcommand{\placetextbox}[4][center]{%
  % [#1]: box anchor: center (default) |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Useful shortcuts for math fonts
\newcommand{\ms}{\mathsf}
\newcommand{\mb}{\mathbf}
\newcommand{\mi}{\mathit}
\newcommand{\mt}{\mathtt}
\newcommand{\mc}{\mathcal}
\newcommand{\mf}{\mathfrak}

\title{TITLE}
\subtitle{SUBTITLE}
\date{CONFERENCE}
\author{Ryan Kavanagh}
\institute{Carnegie Mellon University}%\\\\Funded in part by an NSERC Postgraduate Fellowship}

\newenvironment<>{question}[1]{\begin{exampleblock}{Question}{#1}}{\end{exampleblock}}
\newenvironment<>{fact}[1]{\begin{exampleblock}{Fact}{#1}}{\end{exampleblock}}
\newtheorem{proposition}[theorem]{Proposition}

\newcommand{\nti}[1]{\note[item]{#1}}
\newcommand{\tikzmark}[1]{\tikz[remember picture] \node[coordinate] (#1) {#1};}

\tikzset{node/.style = {align=center,draw=\roran, very thick,
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\usepackage{etoolbox}

\begin{document}

\maketitle

\begin{frame}[t]
  \nti{A Note}
  \frametitle{A Title}
\end{frame}

\begin{frame}[allowframebreaks]
  \frametitle{Related Work}

  \begin{thebibliography}{abcdef}

  \bibitem[AJ95]{AJ95}
    Abramsky, Samson and Achim~Jung.
    \newblock Domain Theory
    \newblock {\em Handbook of Logic in Computer Science}. Vol 3, 1995.

  \bibitem[BE]{BE}
    Bloom, Stephen L. and Zolt{\'a}n {\'E}sik.
    \newblock Some Equational Laws of Initiality in {2CCC}'s
    \newblock {\em International Journal of Foundations of Computer
      Science}, \textbf{6}(2):95-118, 1995.

  \bibitem[F94]{F94}
    Fiore, Marcelo P.
    \newblock Axiomatic Domain Theory in Categories of\\
    Partial Maps
    \newblock PhD thesis. The University of Edinburgh, 1994.

  \end{thebibliography}
\end{frame}

\end{document}