How to change size of button in sweet alert?

swal({
      title: `Are you sure to delete this news posted by ${news.users.user_name} ?`,
      text: `Once deleted, you will not be able to recover this post!`,
      icon: "warning",
      buttons: true,
      dangerMode: true,
    }).then(willDelete => {
      if (willDelete) {
        this.props.deleteNewsPosts(news._id)
      } else {
        swal(`This news is safe!`)
      }
    })
  }