\ProvidesClass{spectralsequence-example.sty}
\LoadClass{article}
\RequirePackage[landscape,margin=0.1cm,paperheight=16in, paperwidth=9in]{geometry}
\RequirePackage{spectralsequences}
\AtBeginDocument{\centering}
\let\@texttop\vfill
\let\@textbottom\vfill

\pagestyle{plain}