As Roland pointed out in his screencast about the color picker in the Garland or Minelli themes, administrators can easily change the look of the provided themes on their Bryght site. If you want a level of customization beyond colours (for example, setting margins, font sizes, etc.) you can use the Custom CSS box in the theme's configuration. This assumes a knowledge of Cascading Style Sheets; we have links to external CSS tutorials for those who are interested in learning.

• Click Administer » Site building » Themes
• In the row for the theme that's enabled, click the "configure" link.
• Type or paste in the CSS in the Custom CSS box.

Note you will have to be specific as possible, since the CSS appears before the declarations for the Drupal and module CSS. A good example of CSS you can copy into your CSS box is a tip by Michael Angeles for improving the usability of submit buttons on edit screens.