Partialview modal form layout issue

return PartialView("_Customer", collection);

<pre> <script>
        $(function () {
            var placeholderElement = $('#modal-placeholder');
            $(document).on('click', 'button[data-bs-toggle="ajax-modal"]', function (event) {
                var url = $(this).data('url');
                $.get(url).done(function (data) {
                    placeholderElement.html(data);
                    placeholderElement.find('.modal').modal('show');

                });
            });
        })
    </script>