options = {
            btnText: '', // default '확인';
            buttonMod: '--modifier-class', // default undefined
            callback: fn(), // undefined
            href: 'www.url-link.com', // undefined ok 버튼
            href0: 'www.url-link.com', // undefined 취소 버튼
            html: '', // undefined
            message: '',
            title: ''
        }

        // using preset modal - alert, confirm
        uipack.alert({
            // options
            title: 'Greetings! 👋',
            message: 'All good?',
        });

        // creating new modal
        const someModal = new uipack.Modal({
            // options
        });

        // someModal.show();
        // someModal.hide();