[](https://travis-ci.org/PolymerElements/iron-flex-layout) _[Demo and API Docs](https://elements.polymer-project.org/elements/iron-flex-layout)_ ##<iron-flex-layout> The `` component provides simple ways to use [CSS flexible box layout](https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Flexible_boxes), also known as flexbox. This component provides two different ways to use flexbox: 1. [Layout classes](https://github.com/PolymerElements/iron-flex-layout/tree/master/classes). The layout class stylesheet provides a simple set of class-based flexbox rules. Layout classes let you specify layout properties directly in markup. 2. [Custom CSS mixins](https://github.com/PolymerElements/iron-flex-layout/blob/master/iron-flex-layout.html). The mixin stylesheet includes custom CSS mixins that can be applied inside a CSS rule using the `@apply` function. A complete [guide](https://elements.polymer-project.org/guides/flex-layout) to `` is available.