#wc-proforma-popup {
  display:none;
  position:fixed;
  top:0; left:0; right:0; bottom:0;
  background:rgba(0,0,0,.5);
  z-index:9999;
}
#wc-proforma-popup .inner {
  background:#fff;
  width:400px;
  margin:100px auto;
  padding:20px;
  border-radius:10px;
}