This section introduces a new topic and a new language: the CSS language, or cascading stylesheets. Stylesheets work alongside an HTML page to control its appearance.
Stylesheets can control most aspects of the visual appearance of a page. You can use them to alter appearance either on a general per-HTML-tag basis ("all level-one headings should be in 24 pixel Arial font") or more specifically ("this individual paragraph should be right-aligned").
