The document discusses creating sustainable Drupal themes using the Zen base theme. Some key points: 1) Sustainable themes reduce maintenance time as the site grows by working with Drupal's HTML output and focusing on CSS styling rather than custom HTML. 2) Using the Zen base theme as a starting point provides templates and styles that reduce initial development time. 3) Themes should be set up to progressively enhance the site and find common design elements to style rather than using specific, separate styles.

1. Sustainable Theming with Zen Kathleen Murtagh Design 4 Drupal – June 13, 2009 A big Thank You to Colleen Carroll and Palantir for the 'sustainable' concept and John Albin for his work on Zen

6. Equalizes HTML elements across browsers

7. Styles common elements like tabs and messages

8. Adds additional CSS classes to templates Let Zen do the tedious work for you

10. Do not copy over the html-elements.css file

11. Start with a blank mytheme.css file

12. Find the Common Denominator

13. Find the Common Denominator

14. Find the Common Denominator

15. Find the Common Denominator

16. Find the Common Denominator

17. Progressive Enhancement Build for the common denominator Then progressively add enhancements

23. Use the same template for multiple content types

25. Once you have created a Sustainable Theme Sit back and relax. Your building blocks will allow the website to grow on its own