eyframes-animation {
          0% {
            left: var(--c1);
          }

          100% {
            left: var(--c2);
            @apply --keyframe-finish;
          }
        }
        @keyframes x-keyframes-animation {
          0% {
            left: var(--c1);
          }

          100% {
            left: var(--c2);
            @apply --keyframe-finish;
          }
        }
      </style>
      x-keyframes
    </template>
    <script>
    HTMLImports.whenReady(function() {
      Polymer({
     