Extends the \newtheorem command. If you say
\newshadetheorem{theorem}{Theorem} in the preamble then your
regular \begin{theorem} .. \end{theorem} will produce a theorem
statement in a shaded box. It supports all the options of
\newtheorem, including forms \newshadetheorem{..}[..]{..} and
\newshadetheorem{..}{..}[..]. Environments declared using the
package require their body to remain on one page; the mdframed
package can frame and shade theorems, and its environments
break at the end of a page; users are generally recommended,
therefore, to use mdframed.
