\documentclass[landscape]{slides}

\usepackage{graphicx}
\usepackage[usenames]{color}

\definecolor{titlecolor} {rgb}{0.5,0,0.2}%
\definecolor{royalblue} {rgb}{0,0,0.5}%
\definecolor{lineblue} {rgb}{0.6,0.5,1.0}%

\def\heading#1{\parbox{\textwidth}{\centerline{\Large \textcolor {titlecolor}{#1
}}\textcolor {lineblue}{\rule{\textwidth}{2mm}}}\vfill}

\begin{document}

\begin{slide}

\heading{1st slide}

This is the first slide

\vfill\end{slide}


\begin{slide}

\heading{2nd slide}

This is the 2nd one

\vfill\end{slide}


\end{document}