# Gradient background for Beamer slides?

I'm trying to create a background gradient for a set of Beamer slides. This question seems to be doing more or less what I want but the answer does not work for me. If I paste the answer into a file I get this error:

! Undefined control sequence.

l.4 \backgroundsetup
{
? x
No pages of output.
Transcript written on bg.log.


The linked question also doesn't do quite what I want because I would like the gradient to start in the center. I'm going for an effect like this.

I prefer answers using tikz since I have worked with that.

• Have you loaded the background package? Can you provide a minimal working example (MWE)? For the shading like that you can use the radial shading and specify the inner color as well as the outer color. – Qrrbrbirlbel Oct 11 '13 at 18:16
• I was trying to build the answer from the linked question. I didn't think it was worth pasting the whole thing into my question as well. – asm Oct 11 '13 at 18:17

With beamer, you don’t need the background package, the \usebackgroundtemplate macro offers the possibility to set the background.

## Code

\documentclass{beamer}
\usepackage{tikz}
\usebackgroundtemplate{
\begin{tikzpicture}
\path [outer color = green!20, inner color = blue!10]
(0,0) rectangle (\paperwidth,\paperheight);
\end{tikzpicture}}
\title{This is the title.}
\begin{document}
\maketitle
\end{document}