body { background:url(background.jpg) center center; overflow:hidden; margin:0; padding:0; background-size:cover;}
i {
  position: absolute;
  top:0; bottom:0;left:0;right:0;
  display:block;
  background:rgba(18, 25, 85,.4);
  z-index:-1;
}
canvas#spiders {
  height:100vh;
}