I started my tests by stylizing a static RSS file with CSS after transforming it with XSLT and linking to the page through the link element. Browsers apply in this case their own custom template to the RSS file and display it accordingly, so there's no way to circumvent browser default formatting for an RSS document (static in this case). I need more time in order to use a server-side XSLT processing for displaying an RSS document generated on the fly. Time will tell.