ffects before app-header.
    import '../../app-scroll-effects/effects/waterfall.js';
    import '../../app-header/app-header.js';
    import '../../app-toolbar/app-toolbar.js';
    import '../../demo/sample-content.js';
    import '../app-header-layout.js';
  </script>

  <custom-style>
    <style is="custom-style">

      html, body {
        height: 100%;
      }

      body {
        margin: 0;
        font-family: 'Roboto', 'Noto', sans-serif;
        background-color: #666;
      }

      app-header-l