Page specific CSS Modify a page using the Page specific CSS option. Themes control the overall look and feel of your portal, but you can always change individual components to something more specific. For example, you can use CSS to enhance a page within your portal: From the Service Portal Configuration page (sp_config), click Page Editor. Find the page you want to style in the page list. Select the top-level node in the page hierarchy to open the Editor for that page. In the Page Specific CSS field, enter CSS for the styles you want to change on the page.