\documentclass{article}
\usepackage{web}
\margins{0pt}{0pt}{0pt}{0pt}   %% Kein Seitenrand
\screensize{150mm}{300mm}      %% Dimensionen: H\"{o}he, Breite des Dokuments

\parindent0pt

\usepackage{pstricks,pstricks-add}

\definecolor{latviaMaroon}{HTML}{9E1B34}



\begin{document}

\thispagestyle{empty}

\begin{pspicture}(0,0)(30,15)
%% Flagge (Verh\"{a}ltnis 2 Breite : 1 H\"{o}he)
%% H\"{o}he 2 - 1 - 2
\psframe[linecolor=latviaMaroon,fillstyle=solid,fillcolor=latviaMaroon](0,9)(30,15)
\psframe[linecolor=white,fillstyle=solid,fillcolor=white](0,6)(30,9)
\psframe[linecolor=latviaMaroon,fillstyle=solid,fillcolor=latviaMaroon](0,0)(30,6)

\end{pspicture}
\end{document}
