main{
  position:relative;
  isolation:isolate;
  overflow:clip;
  background:#020608;
}

main > :not(.page-contour-field){
  position:relative;
  z-index:1;
}

.page-contour-field{
  position:sticky;
  top:0;
  z-index:0;
  display:block;
  width:100%;
  height:100svh;
  margin-bottom:-100svh;
  opacity:.42;
  pointer-events:none;
  mix-blend-mode:screen;
}

@media(max-width:820px){
  .page-contour-field{opacity:.32}
}