.ui-widget-overlay {
  background: #000 url(//cdn.shopify.com/s/files/1/0170/3534/t/6/assets/ui-bg_flat_0_7f7f7f_40X100.png?12231579731917288282) 50% 50% repeat-x;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: .6;
  filter: Alpha(Opacity=60); 
}
.ui-widget-content {
  background-color: #FFF;
  text-align: center;
}
.ui-dialog-content {
  margin: 15px 80px 0px 80px;
  width: 50%;
}
.cart-add-dialog .ui-dialog-titlebar-close {
  display: none;
}
.ui-dialog-buttonset button {
  margin: 3px;
  width: 47%;
}
.ui-dialog {
  color: #333;
  font-size: 11px;
  line-height: 17px; 
}