\documentclass{article}
\usepackage{web}
\margins{0pt}{0pt}{0pt}{0pt}   %% Kein Seitenrand
\screensize{200mm}{250mm}      %% Dimensionen: H\"{o}he, Breite des Dokuments

\parindent0pt

\usepackage{pstricks,pstricks-add}

\definecolor{monacoRed}{cmyk}{0 0.9 0.8 0.05}


\begin{document}

\thispagestyle{empty}

\begin{pspicture}(0,0)(25,20)
%% Flagge (Verh\"{a}ltnis 5 Breite : 4 H\"{o}he)
\psframe[linecolor=white,fillstyle=solid,fillcolor=white](0,0)(25,10)
\psframe[linecolor=monacoRed,fillstyle=solid,fillcolor=monacoRed](0,10)(25,20)


\end{pspicture}
\end{document}
