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\documentclass{standalone}
\standaloneconfig{margin=0.5cm}

%%%%%%%%%%%%%%%%%%%
\usepackage{tgchorus}
\usepackage[T1]{fontenc}
%%%%%%%%%%%%%%%%%%%
\usepackage[margin=15mm]{geometry}
\usepackage{tikz}
\usepackage{amsmath,amssymb,mathrsfs,tikz,pifont}
\usepackage{enumitem}
\usetikzlibrary{shadows.blur} % Bibliothèque pour les ombres

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\setlist[enumerate,1]{label=\protect\circitem{\arabic*}}
\setlist[enumerate,2]{label=\protect\boxitem{\alph*}}

\usepackage{array,multirow}
\usepackage[most]{tcolorbox}

\newtcolorbox{exa}[2][]{enhanced,breakable,before skip=2mm,after skip=5mm,
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\begin{document}

\vskip2cm

\begin{exa}[colbacktitle=blue!85]{Exercice 1}
    Dans $\mathscr{M}_2(\mathbb{R})$, on considère le sous-ensemble :

  \[
    E = \left\{M(x) = \begin{pmatrix}
        x & x \\
        0 & 0
    \end{pmatrix} \mid x \in \mathbb{R}\right\}, \text{ On pose : } E^* = E - \{M(0)\}
  \]
\end{exa}

\end{document}

	

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