chromium/chrome/browser/resources/chromeos/smb_shares/smb_share_dialog.html

<!-- The common style definitions should go to <add-smb-share-dialog>
  component for consistency, because that component is used in both Files app
  and OS settings page. Only Files app specific styles should be added here.
-->
<style>
  add-smb-share-dialog::part(dialog) {
    border-radius: 0;
    height: 100%;
    width: 100%;
  }

  /* SMB dialog inside Files app is rendered inside a native dialog with fixed
    height, so we need to hard-code the body height. */
  add-smb-share-dialog::part(body) {
    height: 425px;
  }
</style>

<add-smb-share-dialog on-close="onDialogClose_">
</add-smb-share-dialog>