\newcommand\floatc@greybox[2]{{\bf #1} #2\par}
\newcommand\fs@greybox{\let\@fs@capt\floatc@greybox
  \def\@fs@pre{\begin{center}\begin{minipage}{15cm} }%
  \def\@fs@mid{\kern5pt}%
  \def\@fs@post{\end{minipage}\end{center} }% }%
\let\@fs@iftopcapt\iftrue}
\floatstyle{greybox}
\newfloat{activity}{thp}{loa}[section]
\floatname{activity}{Activity}
