ha-frontend/src/layouts/ha-app-layout.html

<link rel="import" href="../../bower_components/polymer/polymer-element.html">
<link rel="import" href="../../bower_components/app-layout/app-header-layout/app-header-layout.html">
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Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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<!--
This code is copied from app-header-layout.
'fullbleed' support is removed as Home Assisstant doesn't use it.
transform: translate(0) is added.
-->

<dom-module id="ha-app-layout">
  <template>
    <style>
      :host {
        display: block;
        /**
         * Force app-header-layout to have its own stacking context so that its parent can
         * control the stacking of it relative to other elements (e.g. app-drawer-layout).
         * This could be done using `isolation: isolate`, but that's not well supported
         * across browsers.
         */
        position: relative;
        z-index: 0;
      }
      #wrapper ::slotted([slot=header]) {
        @apply --layout-fixed-top;
        z-index: 1;
      }
      #wrapper.initializing ::slotted([slot=header]) {
        position: relative;
      }
      :host([has-scrolling-region]) {
        height: 100%;
      }
      :host([has-scrolling-region]) #wrapper ::slotted([slot=header]) {
        position: absolute;
      }
      :host([has-scrolling-region]) #wrapper.initializing ::slotted([slot=header]) {
        position: relative;
      }
      :host([has-scrolling-region]) #wrapper #contentContainer {
        @apply --layout-fit;
        -webkit-overflow-scrolling: touch;
      }
      :host([has-scrolling-region]) #wrapper.initializing #contentContainer {
        position: relative;
      }
      #contentContainer {
        /* Create a stacking context here so that all children appear below the header. */
        position: relative;
        z-index: 0;
      }
      .scroll-limiter {
        /* Using 'transform' will cause 'position: fixed' elements to behave like
           'position: absolute' relative to this element. */
        transform: translate(0);
      }
      :host([has-scrolling-region]) .scroll-limiter {
        overflow-y: auto;
        height: 100%
      }
      @media print {
        :host([has-scrolling-region]) .scroll-limiter {
          overflow-y: visible;
        }
      }
    </style>

    <div id="wrapper" class="initializing">
      <slot id="headerSlot" name="header"></slot>

      <div id="contentContainer">
        <div class="scroll-limiter">
          <slot></slot>
        </div>
      </div>
    </div>

  </template>
</dom-module>

<script>
class HaAppLayout extends customElements.get('app-header-layout') {
  static get is() { return 'ha-app-layout'; }
}
customElements.define(HaAppLayout.is, HaAppLayout);
</script>