是否有一个 beamer 主题或一个 beamer 颜色主题可以产生像下面这张取自官方文档的图片那样的背景颜色?谢谢!
\documentclass[]{beamer}
\title{There Is No Largest Prime Number}
\subtitle{With an introduction to a new proof technique}
\author{Euclid of Alexandria}
\institute{Department of Mathematics\\University of Alexandria}
\date[ISPN ’80]{27th International Symposium of Prime Numbers, -280}
\begin{document}
\begin{frame}
\titlepage
\begin{block}{Results}
Proof of the Main Theorem
\end {block}
\end{frame}
\end{document}