@polymer/polymer/test/unit/styling-import-shared-styles.html

The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to

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<dom-module id="shared-styles">
  <style>
    :host {
      border: 4px solid tomato;
    }
  </style>
  <link rel="import" type="css" href="styling-import1.css">
  <link rel="import" type="css" href="styling-import2.css">
  <template>
    <style>
      #three {
        border: 3px solid tomato;
      }
    </style>
  </template>
</dom-module>