\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}