-button {
                background:rgba(255,255,255,0.2)
            }
        </style>
        <content></content>
        <script type="text/plain" class="style">
            .core-overlay-backdrop {
                background:{{color}};
            }

            .core-overlay-backdrop.core-opened {
                opacity:{{opacity}};
            }

        </script>
    </template>
    <script>
        Polymer({
            backdrop: true,
            layered: true,
            backdropOverride: unde