shadow.html

<link rel="import" href="version.html">
<link rel="import" href="../polymer/lib/elements/custom-style.html">

<custom-style>
  <style is="custom-style">
    html {
      /* from http://codepen.io/shyndman/pen/c5394ddf2e8b2a5c9185904b57421cdb */
      --material-shadow-elevation-2dp: 0 2px 2px 0 rgba(0, 0, 0, 0.14), 0 1px 5px 0 rgba(0, 0, 0, 0.12), 0 3px 1px -2px rgba(0, 0, 0, 0.2);
      --material-shadow-elevation-3dp: 0 3px 4px 0 rgba(0, 0, 0, 0.14), 0 1px 8px 0 rgba(0, 0, 0, 0.12), 0 3px 3px -2px rgba(0, 0, 0, 0.4);
      --material-shadow-elevation-4dp: 0 4px 5px 0 rgba(0, 0, 0, 0.14), 0 1px 10px 0 rgba(0, 0, 0, 0.12), 0 2px 4px -1px rgba(0, 0, 0, 0.4);
      --material-shadow-elevation-6dp: 0 6px 10px 0 rgba(0, 0, 0, 0.14), 0 1px 18px 0 rgba(0, 0, 0, 0.12), 0 3px 5px -1px rgba(0, 0, 0, 0.4);
      --material-shadow-elevation-8dp: 0 8px 10px 1px rgba(0, 0, 0, 0.14), 0 3px 14px 2px rgba(0, 0, 0, 0.12), 0 5px 5px -3px rgba(0, 0, 0, 0.4);
      --material-shadow-elevation-12dp: 0 12px 16px 1px rgba(0, 0, 0, 0.14), 0 4px 22px 3px rgba(0, 0, 0, 0.12), 0 6px 7px -4px rgba(0, 0, 0, 0.4);
      --material-shadow-elevation-16dp: 0 16px 24px 2px rgba(0, 0, 0, 0.14), 0 6px 30px 5px rgba(0, 0, 0, 0.12), 0 8px 10px -5px rgba(0, 0, 0, 0.4);
      --material-shadow-elevation-24dp: 0 24px 38px 3px rgba(0, 0, 0, 0.14), 0 9px 46px 8px rgba(0, 0, 0, 0.12), 0 11px 15px -7px rgba(0, 0, 0, 0.4);
    }
  </style>
</custom-style>