text off the screen

I just started using Prosper and I'm using WinEdt at the TeX Editor. When I compile my sample file, the text appears off the screen. I think the problem is that the document isn't being made as landscape, but I'm not sure. The sample code is:
 
 
\documentclass[azure,slideColor,pdf]{prosper}
\begin{document}
\begin{slide}{Test}
    $e^{i\pi} = -\pi$
\end{slide}
\end{document}

Thanks.

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