My latex code is give below :
\documentclass{beamer}
\begin{document}
\title{Simple Beamer Class}
\author{Sascha Frank}
\date{\today}
\begin{definition}
Two graphs $G=(V,E_1)$ and $H= (V,E_2)$ are said to be isomorphic if there exist a bijective map $\phi : V \mapsto V$ that preserve edges and non-edges
\end{definition}
}
I have seen this answer but its code is not working in a beamer class. I want boxes like this.
