Unless I make the slide very tiny, the "close" tab

Hi,
Unless I make the slide very tiny, the "close" tab is invisible. Even at 400X400 in my labtop the close tap is not visible.

Is there a way to make sure that it will be visible or to add a "close" code at the end? There are several slides that I want the visitor to be able to read or perhaps take action on, and it's best to leave the slide long and have them close it.

Thanks,
MM