# Align beamer color box at bottom of frame

due to problems trying to make a footnote without number (the objective is to include the source of an image), I tried using beamercolorbox with a tiny font (maybe is not the most correct option, but produces what I want, text without a border).

Here is my example:

\documentclass[pdf]{beamer}
\usepackage[spanish,es-tabla,es-nodecimaldot]{babel}
\usepackage[utf8]{inputenc}
\setbeamerfont{footnote}{size=\tiny}
\mode<presentation>{\usetheme{Warsaw}}

\begin{document}

\begin{frame}{Introducción}
\begin{minipage}[0.9\textheight]{\textwidth}
\begin{columns}
\begin{column}[]{0.5\textwidth}
texto 1
\end{column}
\begin{column}[]{0.5\textwidth}
texto 2
\end{column}
\end{columns}
\end{minipage}
\begin{minipage}[0.1\textheight]{\textwidth}
\begin{beamercolorbox}[width=\textwidth,bottom]{}
{\tiny
Fuente: Experimental analysis, modeling and simulation of a solar energy accumulator with paraffin wax as PCM}
\end{beamercolorbox}
\end{minipage}
\end{frame}


It seems like the height argument of the minipages is not respected. This example contains what I want, an image (here text) at the left, text at the right (because of this I use columns in first minipage), and the 'footnote' at the bootom (wich I can't make to work). Just to clarify, I read several post asking about alignment of text inside a box, I want the box alig

Thanks to everyone.

• The beamercolorbox environment does not provide a width option or a bottom option... – Paul Gaborit Dec 4 '17 at 8:34
• The height of a minipage is its second optional argument: \begin{minipage}[t][0.9\textheight]{\textwidth}... – Paul Gaborit Dec 4 '17 at 8:38
• @PaulGaborit I failed to find a list of the available arguments to beamercolorbox, the bottom option was part of my attempt to align it to the bottom of the frame, I expected an error message for non existent arguments. Putting the height as second optional argument worked, thanks. – Francisco Angel Dec 4 '17 at 14:21
• @PaulGaborit Would you like to add an answer? – user36296 Jan 14 '18 at 13:36
• @samcarter I don't know how to produce a bottom aligned box with beamer.... – Paul Gaborit Jan 14 '18 at 15:18

You could simply stay with your original idea and use a footnote without number:

\documentclass{beamer}

\newcommand{\nonumbernote}[1]{%
{%
\setbeamertemplate{footnote}{%
\parindent 1em\noindent%
\raggedright
\insertfootnotetext\par%
}
\footnotetext[42]{#1}
}
}

\begin{document}

\begin{frame}

\nonumbernote{Fuente: Experimental analysis, modeling and simulation of a solar energy accumulator with paraffin wax as PCM}
\end{frame}

\end{document}