venn-diag-2

\documentclass[]{standalone}
 
\usepackage[]{graphicx}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\tikzset{>=latex}
\usetikzlibrary{arrows,arrows.meta}
\usepackage{steinmetz}
\newcommand*{\equal}{=}
\usepackage{subcaption}

\usepackage{tikz-3dplot}
\usetikzlibrary{decorations.markings}

\tikzset{->-/.style={decoration={
  markings,
  mark=at position #1 with {\arrow{>}}},postaction={decorate}}}

\begin{document}

\def\setA{(0,0) circle (1cm)}
\def\setB{(-1.3,0) circle (1cm)}
\def\setOmega{(-1.5,-1.5) rectangle (1.5, 1.5) node[left=10pt, draw=black,fill=white] {\large $\Omega$}}

\begin{tikzpicture}[scale=0.8]
  \draw[black,thick,rounded corners=8pt, fill=white] \setOmega;
  \filldraw[blue!50,fill=blue!20,thick,text=black] \setA node {$A$};
  \node[below] at (0, -1.5) {$A \subset \Omega$};
\end{tikzpicture}
  
\hspace{1cm}
\begin{tikzpicture}[scale=0.8]
  \draw[black,thick,rounded corners=8pt, fill=blue!20] \setOmega;
  \filldraw[black,fill=white,thick,text=black] \setA node {$A$};
  \node[below] at (0, -1.5) {$A^c\subset \Omega$};
\end{tikzpicture}



\end{document}