help with this

<!DOCTYPE html>
<html>
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
<link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.indigo-pink.min.css">
<script defer src="https://code.getmdl.io/1.3.0/material.min.js"></script>

<!-- Always shows a header, even in smaller screens. -->
<div class="mdl-layout mdl-js-layout mdl-layout--fixed-header">
  <header class="mdl-layout__header">
    <div class="mdl-layout__header-row">
      <!-- Title -->
      <span class="mdl-layout-title">MateriaIcons</span>
      <!-- Add spacer, to align navigation to the right -->
      <div class="mdl-layout-spacer"></div>
      <!-- Navigation. We hide it in small screens. -->
      <nav class="mdl-navigation mdl-layout--large-screen-only">
        <a class="mdl-navigation__link" href="">Link</a>
        <a class="mdl-navigation__link" href="">Link</a>
        <a class="mdl-navigation__link" href="">Link</a>
        <a class="mdl-navigation__link" href="">Link</a>
      </nav>
    </div>
  </header>
  <div class="mdl-layout__drawer">
    <span class="mdl-layout-title">hold me please</span>
    <nav class="mdl-navigation">
      <a class="mdl-navigation__link" href="">Link</a>
      <a class="mdl-navigation__link" href="">Link</a>
      <a class="mdl-navigation__link" href="">Link</a>
      <a class="mdl-navigation__link" href="">Link</a>
    </nav>
  </div>
  <main class="mdl-layout__content">
    <div class="page-content"><!-- Your content goes here --></div>
  </main>
</div>
<body>
  <!-- Colored FAB button -->
  <button class="mdl-button mdl-js-button mdl-button--fab mdl-button--colored">
    <i class="material-icons">add</i>
  </button>

  <label class="mdl-switch mdl-js-switch mdl-js-ripple-effect" for="switch-2">
    <input type="checkbox" id="switch-2" class="mdl-switch__input">
    <span class="mdl-switch__label"></span>
  </label>


<button id="demo-show-toast" class="mdl-button mdl-js-button mdl-button--raised" type="button">Show Toast</button>
<div id="demo-toast-example" class="mdl-js-snackbar mdl-snackbar">
  <div class="mdl-snackbar__text"></div>
  <button class="mdl-snackbar__action" type="button"></button>
</div>
<script>
(function() {
  'use strict';
  window['counter'] = 0;
  var snackbarContainer = document.querySelector('#demo-toast-example');
  var showToastButton = document.querySelector('#demo-show-toast');
  showToastButton.addEventListener('click', function() {
    'use strict';
    var data = {message: 'Example Message # ' + ++counter};
    snackbarContainer.MaterialSnackbar.showSnackbar(data);
  });
}());
</script>

<h1></h1>

<p></p>

</body>
</html>