I desire to customize block in beamer that looks like this image:

I have tried to use column style but most times I have been unable to write the same length of reasonable text in each column unlike my MWE:
\documentclass[11pt]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{blindtext}
\usetheme{Madrid}
\begin{document}
\begin{frame}[shrink=30]
\frametitle{~}
\begin{columns}
\column{.45\textwidth}
\begin{block}{~}
\blindtext
\end{block}
\column{.45\textwidth}
\begin{block}{~}
\blindtext
\end{block}
\end{columns}
\end{frame}
\end{document}
I do not want it to have a global effect on the beamer, one should be able to call for it when need be.