Lexicon is a design language that provides a common framework for building consistent UIs. Clay, the web implementation of Lexicon, is an extension of Bootstrap’s open source CSS Framework. Bootstrap is by far the most popular CSS framework on the web. Built with Sass, Clay CSS fills the front-end gaps between Bootstrap and the specific needs of Liferay DXP.
These tutorials look briefly at Clay CSS and show you how to use it in your themes.