\newcommand{\bloc}[3]{%
  \begin{minipage}{\dimexpr 0.30\linewidth * #3 + ( 4cm * (#3 - 1 ) ) \relax}
    \begin{tcolorbox}[
      enhanced,
      top=0.5cm,
      bottom=0mm,
      left=0mm,
      right=0mm,
      boxsep=0pt,
      colback=mediumBlue,
      colframe=headercolor!20,
      boxrule=0pt,
      arc=12pt,
      drop fuzzy shadow={
        shadow xshift=1cm,
        shadow yshift=-1cm,
        color=black!10,
        shadow blur steps=20
      },
      height=24cm
    ]

      \begin{tcolorbox}[
        enhanced,
        top=2cm,
        bottom=2cm,
        left=2cm,
        right=2cm,
        boxsep=0pt,
        colback=white,
        colframe=white,
        boxrule=0pt,
        sharp corners,
        rounded corners=southwest,
        rounded corners=southeast,
        arc=12pt,
        height=24cm
      ]

        \textcolor{mediumBlue}{
          \textbf{\fontsize{36pt}{48pt}\selectfont #1}
        }

        \vspace{1cm}

        {\fontsize{24pt}{36pt}\selectfont #2}

      \end{tcolorbox}
    \end{tcolorbox}
  \end{minipage}
}