modal is not showing up but code js is ok

[Josbla]

property "display" is "none" instead of "block" when modal is open in modal class bootstrap css
that causes the effect backdrop appears, and html code of modal do same, but that is not visible, and can not be dissmised because i'm using manualy close functions.
i have the modal inside a div, like this:

<div>
    <div class="modal">
        ...modal head, content, foter...
    </div>
</div>

and I calling this usin the function modal.element.modal().