The document discusses Eclipse RAP design. It covers UI work including branding, themes using CSS, and layout. Branding is configured using the org.eclipse.rap.ui.branding extension point. Themes are configured using the org.eclipse.rap.ui.themes extension point. Layout is configured using the org.eclipse.rap.ui.layout extension point. The document provides references for further information on branding, theming, look and feel customization, and creating custom widgets.