# How to draw a line between columns in beamerposter, reaching from header to bottom?

I am trying to make a poster using the beamerposter package and have a line below a header block (containing title, authors etc.). Now I want to draw a vertical line in the middle of the poster (separating the columns), that starts at the header line and ends at the lower end of the poster.

I already found this very similar question, but the line there is only as short as possible. Here is a MWE with the short vertical line:

\documentclass[final,hyperref={pdfpagelabels=false}]{beamer}

\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{multicol}
\usepackage[orientation=portrait,size=a0,scale=1.4,debug]{beamerposter}

\setlength{\columnseprule}{2mm}

\begin{document}
\begin{frame}
\rule{\paperwidth}{2mm}
\end{beamercolorbox}

\begin{multicols}{2}
\huge some text\\
some more text
\end{multicols}
\end{frame}
\end{document}


How can I draw a longer vertical line?

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I don't know if this really answers your question; printing half of the horizontal rule, a very long vertical one (but "smashed", so its length is not "seen" by TeX) and the other half rule seems to work.

I use some low level commands, so to avoid some glitches with \rule.

\documentclass[final,hyperref={pdfpagelabels=false}]{beamer}

\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{multicol}
\usepackage[orientation=portrait,size=a0,scale=1.4,debug]{beamerposter}
\usepackage{lipsum}
%\setlength{\columnseprule}{2mm}

\begin{document}
\begin{frame}
\centering\huge Headline and stuff\\
\rule{.5\paperwidth}{2mm}\kern-1mm
\smash{\vrule height 0pt depth \paperheight width 2mm}\kern-1mm
\rule{.5\paperwidth}{2mm}%
\end{beamercolorbox}

\begin{multicols}{2}
\huge \lipsum[1-3]
\end{multicols}
\end{frame}
\end{document}


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I do not really understand what the TeX commands do, but your solution works perfectly. Thank you! –  Tim Feb 16 '13 at 18:39