\usepackage{mdframed,xcolor} \definecolor{shadecolor}{gray}{0.9} \definecolor{rulecolor}{gray}{0.4} \mdfdefinestyle{thm}{ % saving some space skipabove=1em plus 0.4em minus 0.6em, skipbelow=0.5em plus 0.4em minus 0.2em, leftmargin=-7pt, rightmargin=-7pt, innerleftmargin=6pt, innerrightmargin=6pt, innertopmargin=3pt, innerbottommargin=3pt, linewidth=1pt, linecolor=rulecolor, backgroundcolor=shadecolor, splittopskip=1.2em minus 0.2em, splitbottomskip=0.5em plus 0.2em minus 0.1em, }