YUI Grids CSS The foundational YUI Grids CSS offers four preset page widths, six preset templates, and the ability to stack and nest subdivided regions of two, three, or four columns. The 4kb file provides over 1000 page layout combinations. Other features include: Supports fluid-width (100%) layouts as well as preset fixed-width layouts at 750px, 950px, and 974px, and the ability to easily custom