No Close Link in ShareThis Modal

With the email ShareThis icon, when this is clicked it opens a modal. The modal has a 'Close' link in the top right corner so the user can exit the modal by clicking this link or by clicking outside the modal.
The last ShareThis icon also opens a modal window; however, this does not contain a 'Close' link. The only way to exit is by clicking outside the modal. It appears that while the markup for a close link is present in the final ShareThis modal, the wrapper div is styled to be hidden.
In order to give our users a more cohesive experience, I would think both of these modals should have this link. Is it possible to add this to the ShareThis modal?