[Tex/LaTex] Two-color background

Question

I am creating a poster using Latex and would like to split the background into two parts. Then I was wondering how we can create a background that is two-colored. For example, upper part is red and lower part is yellow (as on the exemplary image)?

Answer 1

You could use background. You don't give a minimal example, so your kilometres may well vary:

\documentclass[a4paper]{article}
\usepackage{geometry,tikz}
\usetikzlibrary{calc}
\usepackage[placement=bottom,scale=1,opacity=1]{background}
\backgroundsetup{contents={%
    \begin{tikzpicture}
      \fill [red] (current page.north west) rectangle ($(current page.north east)!.2!(current page.south east)$) coordinate (a);
      \fill [yellow] (current page.south west) rectangle (a);
    \end{tikzpicture}}}
\usepackage{kantlipsum}
\begin{document}
\kant[1-5]
\end{document}