/style>
  <template>
    <paper-material elevation="1">
      <h2>Sign In</h2>
      <div>
        <paper-input label="Username"></paper-input>
      </div>
      <div>
        <paper-input label="Password"></paper-input>
      </div>
    </paper-material>
  </template>
  <script>
    Polymer({
      is: 'login-panel',
      behaviors: [Polymer.NeonAnimationRunnerBehavior],
      properties: {
        opened: {
          type: Boolean
        },
        animationConfig: {
          value: function() {
     