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[](https://travis-ci.org/PolymerElements/iron-flex-layout)
[](https://beta.webcomponents.org/element/PolymerElements/iron-flex-layout)
## <iron-flex-layout>
The `<iron-flex-layout>` 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/iron-flex-layout-classes.html).
The layout class stylesheet provides a simple set of class-based flexbox rules, that
let you specify layout properties directly in markup. You must include this file
in every element that needs to use them.
Sample use:
<!--
```
<custom-element-demo>
<template>
<script src="../webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="iron-flex-layout-classes.html">
<dom-module id="demo-element">
<template>
<style is="custom-style" include="iron-flex iron-flex-alignment"></style>
<style>
.container, .layout {
background-color: #ccc;
padding: 4px;
}
.container div, .layout div {
background-color: white;
padding: 12px;
margin: 4px;
}
</style>
<next-code-block></next-code-block>
</template>
<script>Polymer({is: "demo-element"});</script>
</dom-module>
<demo-element></demo-element>
</template>
</custom-element-demo>
```
-->
```html
<div class="layout horizontal layout-start" style="height: 154px">
<div>cross axis start alignment</div>
</div>
```
1. [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.
Please note that the old [/deep/ layout classes](https://github.com/PolymerElements/iron-flex-layout/tree/master/classes)
are deprecated, and should not be used. To continue using layout properties
directly in markup, please switch to using the new `dom-module`-based
[layout classes](https://github.com/PolymerElements/iron-flex-layout/tree/master/iron-flex-layout-classes.html).
Please note that the new version does not use `/deep/`, and therefore requires you
to import the `dom-modules` in every element that needs to use them.
A complete [guide](https://elements.polymer-project.org/guides/flex-layout) to `<iron-flex-layout>` is available.
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