#gnewtonPopover {
  display: none;
  position: absolute;
  z-index: 99999;
  margin: -300px 0 0 -350px;
  top: 50%;
  left: 50%;
  background-color: #FFF;
  width: 700px;
  height: 600px;
  border-radius: 0px !important;
  -moz-border-radius: 0px !important;
  -webkit-border-radius: 0px !important;
  box-sizing: border-box;
  -moz-box-sizing:border-box; /* Firefox */
  -webkit-box-sizing:border-box; /* Safari */
  box-shadow: 0px 0px 10px 0px gray;
  -webkit-box-shadow: 0px 0px 10px 0px gray;
  -moz-box-shadow: 0px 0px 10px 0px gray;
}

@media (max-width: 768px) {
  #gnewtonPopover {
    top: 0px;
    display: none;
    margin: 0px;
    left: 0px;
    right: 0px;
    width: 100%;
    }
}