chromium/chrome/browser/resources/password_manager/sharing/share_password_loading_dialog.html

<style include="shared-style">
  paper-spinner-lite {
    display: flex;
    margin-inline: auto;
    margin-block: 40px 56px;
  }
</style>

<cr-dialog close-text="$i18n{close}" show-on-attach>
  <share-password-dialog-header slot="title">
    [[dialogTitle]]
  </share-password-dialog-header>
  <paper-spinner-lite slot="body" active></paper-spinner-lite>
</cr-dialog>