% !TEX TS-program = lualatex
\DocumentMetadata{
  lang=en,
  tagging=on,
  pdfstandard=ua-2,
%  check-tagging-status,
  tagging-setup={
%    math/alt/use,               % iff Ally
%    role/new-tag=frametitle/H1, % iff Ally
    math/setup=mathml-SE
  }
}
\documentclass{ltx-talk}

\date{Date}
\title[Short Title]{Full Title}
\subtitle{Subtitle}
\author[Short Author]{Full Author Name}
\institute{University of North Dakota}

% true value
%\providecolor{maybeUNDgreen}{Hsb}{146,1,0.62}
% more contrast with white
\providecolor{maybeUNDgreen}{Hsb}{146,1,0.53}

\EditInstance{header}{std}{
  background-color = maybeUNDgreen,
  color            = white,
}

\DeclareInstance{footer-element}{frameoftotal}{talk}{}
\ExpandArgs{c}\newcommand{@frameoftotal}{%
 \arabic{frame}/\RefProperty{lastpage}{totalframes}
}
\EditInstance{footer}{std}{
  color         = black!75,
  separator     = \hfill|\hfill,
  element-order = {date, author, title, frameoftotal},
}

\DeclareInstance{titlepage-element}{titlegraphic}{talk}{}
% department logo obtained locally
% other graphics from https://campus.und.edu/brand/downloads.html
% primary logotype, full color, svg converted to pdf
\ExpandArgs{c}\newcommand{@titlegraphic}{%
  \addvspace{\medskipamount}
  \includegraphics[
    actualtext={University of North Dakota, Mathematics \& Statistics},
    width=5cm
  ]{MathStats-CMYK_primary.jpg}% logotype-full
  \addvspace{\smallskipamount}
}
\newsavebox\logobox
\savebox\logobox{%
  \includegraphics[artifact, height=\baselineskip]{flame-w-rgb}}
\AddToHook{shipout/foreground}{%
  \put(\paperwidth - \wd\logobox - 10mm,
       -8.5mm){\usebox\logobox}} % -\ht\logobox


\begin{document}

\begin{frame}
\maketitle[
  element-order = {title, author, titlegraphic, date},
  framestyle = plain,
]
\end{frame}

\begin{frame}
\frametitle{Sample frame}
with some content
\end{frame}

\end{document}