\documentclass[aspectratio=169]{beamer}
\usepackage[T1]{fontenc} %pipes don't display properly without this
\usepackage[utf8]{inputenc}
\usepackage{listings}
\usepackage{color}
\usepackage{datapie}
\usepackage{multicol}
\usepackage{upgreek}
\usepackage{siunitx} %pretty measurement unit rendering
\usepackage{hyperref} %enable hyperlink for urls
\usepackage{lmodern}
\usepackage{setspace}

\usefonttheme[onlymath]{serif}
\setcounter{MaxMatrixCols}{20}

\DeclareSIUnit\pixel{px}

\usecolortheme[RGB={37,68,113}]{structure}
\usetheme{Dresden}

\newenvironment{figurehere}
{\def\@captype{figure}}
{}
\makeatother

%Define generic colors
\definecolor{slg}{gray}{0.25}
\definecolor{lg}{gray}{0.55}
\definecolor{vlg}{gray}{0.73}
\definecolor{tlg}{gray}{0.9}

%Define data colors
\definecolor{mygreen}{rgb}{0,0.6,0}
\definecolor{mygray}{rgb}{0.5,0.5,0.5}
\definecolor{mymauve}{rgb}{0.58,0,0.82}

%Define TheAlt colors
\definecolor{ldorange}{HTML}{F18A20}
\definecolor{ldblue}{HTML}{254471}

%Apply TheAlt colors to theme
\setbeamercolor{section in head/foot}{fg=ldorange}
\setbeamercolor{author in head/foot}{fg=white}
\setbeamercolor{subsection in head/foot}{fg=white}
\setbeamercolor{caption name}{fg=vlg}
\setbeamercolor{caption}{fg=vlg}
\setbeamercolor{frametitle}{fg=ldblue}
\setbeamercolor{title}{fg=ldorange}
\setbeamercolor{institute}{fg=ldblue}

\setbeamerfont{title}{series=\bfseries}

\setbeamertemplate{caption}{\raggedright\insertcaption\par}
\setbeamertemplate{navigation symbols}{}
\setbeamertemplate{bibliography item}[text]

\lstdefinestyle{customc}{
	belowcaptionskip=1\baselineskip,
	captionpos=,
	breaklines=true,
	frame=L,
	xleftmargin=\parindent,
	language=C,
	showstringspaces=false,
	basicstyle=\scriptsize\ttfamily,
	rulecolor=\color{tlg},
	backgroundcolor=\color{tlg},
	fillcolor=\color{tlg},
	rulesepcolor=\color{tlg},
	keywordstyle=\bfseries\color{green!40!black},
	commentstyle=\itshape\color{purple!40!black},
	identifierstyle=\color{blue},
	stringstyle=\color{orange},
}

\lstset{language=C,caption={Descriptive Caption Text},label=DescriptiveLabel}