kibana-with-account/src/plugins/kibana/public/dashboard/partials/options.html

kibana-with-account is develop based kibana project

<form role="form" class="options">
  <p>
    <div class="input-group">
      <label>
        <input type="checkbox" ng-model="opts.ui.darkTheme" ng-checked="opts.ui.darkTheme">
        Use dark theme
      </label>
    </div>
  </p>
</form>