if I'll do
\documentclass[a4paper]{article}
\usepackage{lipsum}
\begin{document}
\parbox{\columnwidth}{\lipsum[1-20]}
\end{document}
Is there any way to get a breakable parbox? If not, I will need something different. In that specific setting I only need to do:
\documentclass[a4paper]{article}
\usepackage{calc}
\usepackage{lipsum}
\begin{document}
\textbf{Proof}\par
\noindent\hspace{5mm}\parbox{\columnwidth-10mm}{\lipsum[1-20]}\\
$_{}$\hfill$\square$
\end{document}
Ty'all.
mdframed
as well.