poster.tex

\documentclass[a4paper]{article}

\usepackage{listings}
\usepackage{xcolor}
\usepackage{courier}
\usepackage{eso-pic,graphicx}
\usepackage[top=2cm, bottom=2cm, outer=0cm, inner=0cm]{geometry}
\usepackage{adjustbox}
\usepackage{scrextend}

\begin{document}
\pagenumbering{gobble}
\AddToShipoutPictureBG*{\includegraphics[width=\paperwidth,height=\paperheight]{w10000_i1200.png}}
\ \\
\vspace{14.5cm}
\begin{addmargin}[2.1cm]{2cm}
\begin{adjustbox}{width=6.1cm,keepaspectratio}
\lstset{ %
  basicstyle=\ttfamily,
  commentstyle=\color{gray}\textit,
  extendedchars=true,
  keepspaces=true,
  keywordstyle=\color{gray}\textbf,
  language=Haskell,
  morekeywords={Picture, Word, Word8, fractal, realize, render, trans, grayify, sharpen, main, writePng, generateImage},
  numbers=left,
  numbersep=8pt,
  numberstyle=\tiny\ttfamily,
  showstringspaces=false,
  stepnumber=1
}
\lstinputlisting{fractal.hs}
\end{adjustbox}
\end{addmargin}
\end{document}