The document discusses using CSS gradients to create color transitions and patterns in web page elements. It provides examples of linear gradients that transition between two colors from top to bottom and from left to right. It also demonstrates radial gradients that blend colors in concentric circles and repeating radial gradients that tile blended color circles. The gradients are defined using browser-prefixed CSS properties and the linear-gradient, radial-gradient, and repeating-radial-gradient functions.