<style>
  .page-id-hold .header,
  .page-id-hold nav,
  .page-id-hold navigation,
  .page-id-hold .header-nav-wrapper {
    display: none !important;
  }
  
  /* If you need to adjust page margins after hiding navigation */
  .page-id-hold .content-wrapper {
    padding-top: 0 !important;
  }
</style>