   user-select: none;
      cursor: pointer;
    }

    :host([disabled]) {
      opacity: 0.3;
      pointer-events: none;
    }

    :host([active]),
    :host([pressed]) {
      background-color: #3367D6;
      box-shadow: inset 0 3px 5px rgba(0,0,0,.2);
    }

  </style>

  <template>

    <content></content>

  </template>

  <script>

    Polymer({

      behaviors: [
        Polymer.IronControlState,
        Polymer.IronButtonState
      ],

      hostAttributes: {
        role: 'button'
      }
    