html, body {
  overflow-y: hidden;
}
body:after {
  display: block;
  content: '';
  position: fixed;
  inset: 0;
  background-color: white;
  z-index: 1000000;
}

.ready body:after {
  display: none!important;
}

.ready html {
  overflow-y: inherit;
}
.ready body {
  overflow-y: scroll;
}