Here is a minimal working example on how to create such a block:
% Blocks without title in Beamer \documentclass{beamer} % set a theme to have nice and different blocks \usetheme{Warsaw} \begin{document} \begin{frame}{Blocks without title} % create the main block \begin{exampleblock}{Title of the block} This is the block with the main contents. \end{exampleblock} % create a other blocks, visually separated, % that continues the contents of the previous block \begin{exampleblock}{} A natural but separated continuation of the previous block. \end{exampleblock} \begin{block}{} This is a standard block without title. \end{block} \begin{alertblock}{} This is an alert block without title. \end{alertblock} % since no title is specified, it will not appear the title band \end{frame} \end{document}
Compiling this code yields:
