thread view css

This is the code I am trying to style <xen:title>{xen:helper threadPrefix, $thread, escaped}{$thread.title}{xen:helper pagenumber, $page}</xen:title> <xen:h1>{xen:helper threadPrefix, $thread}{$thread.title}</xen:h1> <xen:description> {xen:phrase discussion_in_x_started_by_y_date_z...