...Download latest release from GitHub and include flex-layout-attribute.min.css in your HTML document. SASS files are provided in the 'sass' directory (see project on GitHub) for further customization. FLA is built with Gulp but you can download and include 'sass' folder in your preferable build setup (grunt, webpack, etc.) FLA is defined with two custom HTML attributes. Layout, use it on the container (parent) element to set layout of its children elements. And self, use it on container/child element to set size or align for the element itself.