Code:
\documentclass{minimal}
\usepackage{multicol}
\usepackage{tcolorbox}
\tcbuselibrary{breakable,skins}
\tcbset{breakable,enhanced}
\begin{document}
\vspace*{16cm}
\begin{tcolorbox}[colback=gray,colframe=black]
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box. Here, you see the
lower part of the box. Here, you see the lower part of the box.
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box. Here, you see the
lower part of the box. Here, you see the lower part of the box.
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box. Here, you see the
lower part of the box. Here, you see the lower part of the box.
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box.
\end{tcolorbox}
\newpage
\begin{multicols}{2}
\vspace*{16cm}
\begin{tcolorbox}[colback=gray,colframe=black]
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box. Here, you see the
lower part of the box. Here, you see the lower part of the box.
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box. Here, you see the
lower part of the box. Here, you see the lower part of the box.
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box. Here, you see the
lower part of the box. Here, you see the lower part of the box.
Here, you see the lower part of the box. Here, you see the lower
part of the box. Here, you see the lower part of the box. Here, you
see the lower part of the box. Here, you see the lower part of the
box. Here, you see the lower part of the box.
\end{tcolorbox}
\end{multicols}
\end{document}
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