[Tex/LaTex] Adding a border around beamer poster

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I am trying to find a simple way to add a uniform border around a LaTeX poster, made in beamer, preferably in such a way that it is easy to modify the thickness.

Here is the first part of the preamble in my .tex file.

\documentclass[final]{beamer}
\usetheme{RJH}
\usepackage[orientation=landscape,size=a0,scale=1.41,debug]{beamerposter}

My current layout is that the entire poster is created in a single frame (i.e. all contained inside \begin{frame} and \end{frame}). So I am looking for a way to put a uniform, adjustable border around the edge of this frame.

It seems like this should be an easy thing, but I have only found directions for adding borders around frames when printing multiple slides on a page (e.g. \pgfpagesuselayout{8 on 1}).

Best Answer

One way with TikZ, requires two compilation passes:

\documentclass[final]{beamer}
\usetheme{RJH}
\usepackage{tikz}
\usepackage[orientation=landscape,size=a0,scale=1.41,debug]{beamerposter}
\begin{document}
\begin{frame}
\begin{tikzpicture}[remember picture,overlay]
\draw [line width=1cm,blue] (current page.south east) rectangle (current page.north west);
\end{tikzpicture}
\end{frame}
\end{document}
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