  <div class="demo-preview-block">

    <label class="mdl-checkbox mdl-js-checkbox mdl-js-ripple-effect" for="checkbox-1">
      <input type="checkbox" id="checkbox-1" class="mdl-checkbox__input" />
      <span class="mdl-checkbox__label">Check me out</span>
    </label>

    <label class="mdl-checkbox mdl-js-checkbox mdl-js-ripple-effect" for="checkbox-2">
      <input type="checkbox" id="checkbox-2" class="mdl-checkbox__input" />
      <span class="mdl-checkbox__label">I'm just a Material girl in a Materi