答案1
由于您没有提供任何内容MWE
,因此我使用标准article
类文件,并且MWE
是:
\documentclass[a4paper]{article}
\usepackage[breakable]{tcolorbox}
\usepackage{amsthm}
\usepackage{lipsum}
% ---------------------------------------------------------------------------- %
\newtcolorbox{proofbox}{
breakable,leftrule=2pt,rightrule=2pt,sharp
corners,toprule=0pt,bottomrule=0pt,colback=white,colframe=cyan}
% ---------------------------------------------------------------------------- %
\begin{document}
\begin{proofbox}
\begin{proof}[D\'{e}monstration]
\lipsum[1]
\end{proof}
\end{proofbox}
\end{document}