documentclass[aspectratio=169]{beamer}
    usepackage{color}
    definecolor{gray}{rgb}{0.76, 0.76, 0.76}
    definecolor{dark-gray}{rgb}{0.36, 0.36, 0.36}
    usebackgroundtemplate{%
        vbox to paperheight{
            vfil
            colorbox{dark-gray}{
                makebox [paperwidth][l]{
                   tinycolor{gray}{
                      hspace{2em}textcopyright Company Name
                   }
                }
             }
        }
    }

    begin{document}
    begin{frame}{ }
     test
    end{frame}
    end{document}