$.fn.progeApriAjaxModal = function(){

    var $this = $(this),
    url = $this.attr( 'data-url' );

    $this.click(function(){

        // CLOSE MODAL FUNCTION
        var progeChiudiAjaxModal = function(){
            $( '.c-modal' ).fadeOut( 300, function(){
                $( '.c-modal .modal-loading' ).show();
                $( '.c-modal .modal-box' ).removeClass( 'animated fadeInDown' ).unbind( 'clickoutside' ).hide();
                $( 'html' ).removeClass( 'm-modal-active' );
            });
            // TRIGGER modalClosed EVENT
            $.event.trigger({
                type: 'modalClosed',
                message: 'Modal is closed.',
                time: new Date()
            });

        };

        // CREATE / SHOW MODAL
        if ( $( '.c-modal' ).length < 1 ) {
            var modalHtml = '<div class="c-modal" style="display: none;">';
            modalHtml += '<div class="modal-loading"><span class="c-loading-anim"><span></span></span></div>';
            modalHtml += '<div class="modal-box" style="display: none;"><button class="modal-close" type="button"></span><span class="icon-box icon-close"></span></button><div class="modal-box-inner"></div></div>';
            modalHtml += '</div>';
            $( 'body' ).append( modalHtml );
        }
        var modal = $( '.c-modal' ),
        modalLoading = $( '.c-modal .modal-loading' ),
        modalBox = $( '.c-modal .modal-box' ),
        modalBoxInner = $( '.c-modal .modal-box-inner' ),
        modalClose = $( '.c-modal .modal-close' );
        modal.fadeIn( 300 );
        $( 'html' ).addClass( 'm-modal-active' );

        // LOAD CONTENT
        modalBoxInner.load( url, function( response, status, xhr ){

            // SHOW MODAL BOX
            modalLoading.fadeOut( 300 );
            modalBox.show().addClass( 'animated fadeInDown' );

            // CLICK ON CLOSE
            modalClose.click(function(){
                progeChiudiAjaxModal();
            });

            // iOS & Chrome BODY SCROLLING FIX
            $( 'body' ).on( 'touchmove', function (e) {
                if ( $( '.c-modal' ).is( ':visible' ) ) {
                    if ( ! $( '.c-modal' ).has( $( e.target ) ).length ) {
                        e.preventDefault();
                    }
                }
            });
            $( 'body' ).on( 'mousewheel DOMMouseScroll', function (e) {
                if ( $( '.c-modal' ).is( ':visible' ) ) {
                    if ( ! $( '.c-modal' ).has( $( e.target ) ).length ) {
                        e.preventDefault();
                    }
                }
            });

            // CLICK OUTSIDE

/*
modalBox.unbind( ‘clickoutside’ ).bind( ‘clickoutside’, function(){
progeChiudiAjaxModal();
});

*/
// ERROR LOADING CONTENT
if ( status == ‘error’ ) {
modalBoxInner.html( ” ).append( ‘Non è stato possibile caricare il link, si prega di riprovare più tardi.

‘ );
}

            // INIT AJAX FORMS
            else {

            }

            // TRIGGER modalOpened EVENT
            $.event.trigger({
                type: 'modalOpened',
                message: 'Modal is opened.',
                time: new Date()
            });

        });

        // DISABLE DEFAULT CLICK ACTION
        return false;

    });

};


<a data-url="https://www.iubenda.com" class="c-button m-open-ajax-modal" rel="nofollow noopener">informativa sulla privacy</a>