\documentclass{viper-slide}
\title{A Sample Presentation}
\author{Author Name}
\institute{Institute Name}
\date{April,27 2021}
\renewcommand{\viperleftfoot}{\hspace*{1cm}Custom Footer}
\begin{document}
\maketitle
\section{Introduction}
\begin{frame}{Frame Title}
An example frame
\end{frame}
\end{document}
