% syntax highlightning bug, nested enviroments are not recognized
\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{fancybox}
\begin{document}
	\newlength{\parboxlength}
	\begin{align*}
		\setlength{\fboxsep}{15pt}
		\setlength{\parboxlength}{\linewidth}
		\addtolength{\parboxlength}{-2\fboxsep}
		\fbox{
		\parbox{\parboxlength}{
			\setlength{\abovedisplayskip}{0pt}
			\setlength{\belowdisplayskip}{0pt}
			\begin{align}
				asdf
			\end{align}
		}}
	\end{align*}
	
	asdfasdfasdfasdfadfasdf

\end{document}
