\documentclass{article}
\usepackage{web}
\margins{0pt}{0pt}{0pt}{0pt}   %% Kein Seitenrand
\screensize{100mm}{150mm}      %% Dimensionen: H\"{o}he, Breite des Dokuments

\parindent0pt

\usepackage{pstricks,pstricks-add}

\definecolor{italyRed}{RGB}{206 43 55} 
\definecolor{italyWhite}{RGB}{241 242 241}
\definecolor{italyGreen}{RGB}{0 146 70}

\begin{document}

\thispagestyle{empty}

\begin{pspicture}(0,0)(15,10)
%% Flagge (Verh\"{a}ltnis 3 Breite : 2 H\"{o}he)

\psframe[linecolor=italyGreen,fillstyle=solid,fillcolor=italyGreen](0,0)(5,10)
\psframe[linecolor=italyWhite,fillstyle=solid,fillcolor=italyWhite](5,0)(10,10)
\psframe[linecolor=italyRed,fillstyle=solid,fillcolor=italyRed](10,0)(15,10)
\end{pspicture}
\end{document}
