Beamer round blocks without fading

Question

I want to define a custom block in beamer.

Here are my definitions:

\documentclass[svgnames]{beamer}
\usepackage{xcolor}
\setbeamertemplate{blocks}[rounded]
\setbeamercolor{block title}{fg=White,bg=Red}
\setbeamercolor{block body}{bg=Blue}
\begin{document}

\begin{frame}
\begin{block}{lala}
fdsfdf
\end{block}
\end{frame}

\end{document}

How do I get rid of the fading effect between the title and the body?

Answer 1

I don't know if I understand your question correctly; if you want to get rid of the vertical shading that goes from the lower part of the title area to the upper part of the body area, you can use \pgfdeclareverticalshading to change the vertical shading bmb@transition (the original definition can be found in beamerbaseboxes.sty):

\documentclass[svgnames]{beamer}
\usepackage{xcolor}
\setbeamertemplate{blocks}[rounded][shadow=false]
\setbeamercolor{block title}{fg=White,bg=Red}
\setbeamercolor{block body}{bg=Blue}

\makeatletter
\pgfdeclareverticalshading[lower.bg,upper.bg]{bmb@transition}{200cm}{%
  color(0pt)=(lower.bg); color(4pt)=(lower.bg); color(4pt)=(upper.bg)}
\makeatother

\begin{document}

\begin{frame}
\begin{block}{lala}
fdsfdf
\end{block}
\end{frame}

\end{document}