.ui-dialog button.ui-dialog-titlebar-close {
  position: absolute;
  right: 15px;
  top: 12px;
  height: 15px;
  width: 15px;
  background: url('/profiles/d2/modules/contrib/panopoly_magic/images/close-popup.png') no-repeat left top;
  border: none;
}

.ui-dialog button.ui-dialog-titlebar-close:hover,
.ui-dialog button.ui-dialog-titlebar-close:focus {
  background: url('/profiles/d2/modules/contrib/panopoly_magic/images/close-popup.png') no-repeat left -15px;
}