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Cascading Style Sheets (CSS) represent a powerful means for Web designers to separate HTML content from presentation. CSS solves many design-related issues, but it also creates new ones, including document management issues and “code bloat.” The CSS Spa has been created to assist designers with CSS management. After spidering a Web site’s CSS content, the CSS Spa follows a series of rules to accomplish this: enforcement of atomic separation; elimination of non-CSS style elements; elimination of inline styles; normalization attributes and values; creation of new CSS “superclasses; ” and finally removal of any unused CSS. The CSS Spa tool was developed using PHP and MySQL, then tested on two sets of sites: three simple learning cases and three real-world Web sites. Each of these test sites represents a different CSS challenge: reliance on older HTML styles; heavy use of inline styles; and enhancement of an already-efficient design. Headings: Web sites-- Design. Cascading style sheets