server/static/bower_components/paper-material/paper-material-shared-styles.html

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<link rel="import" href="../paper-styles/shadow.html">

<dom-module id="paper-material-shared-styles">
  <template>
    <style>
      :host {
        display: block;
        position: relative;
      }

      :host([elevation="1"]) {
        @apply(--shadow-elevation-2dp);
      }

      :host([elevation="2"]) {
        @apply(--shadow-elevation-4dp);
      }

      :host([elevation="3"]) {
        @apply(--shadow-elevation-6dp);
      }

      :host([elevation="4"]) {
        @apply(--shadow-elevation-8dp);
      }

      :host([elevation="5"]) {
        @apply(--shadow-elevation-16dp);
      }
    </style>
  </template>
</dom-module>