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The <iron-flex-layout> component provides simple ways to use CSS flexible box layout, also known as flexbox. This component provides two different ways to use flexbox:

1. Layout classes. 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:

<div class="layout horizontal layout-start" style="height: 154px">
  <div>cross axis start alignment</div>
</div>

1. Custom CSS mixins. 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 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. 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 to <iron-flex-layout> is available.