The document discusses CSS frameworks and grid-based design. It introduces CSS frameworks as sets of tools and best practices that abstract routine tasks into reusable modules. Grid-based design uses a grid system to organize content spatially on a page in a clear, meaningful way for users. The document examines specific CSS frameworks, Blueprint and 960gs, and discusses advantages and disadvantages of working with grids, including how grids can facilitate creativity but also impose restrictions. It also explores using the 960gs framework with the Drupal CMS.