.image-slideshow {
  position:fixed;
  inset:0;
  z-index:0;
  overflow:hidden;
  pointer-events:none;
  background:#fff url("slideshow/01.jpg") center/cover no-repeat;
}
.image-slideshow canvas { display:block; width:100%; height:100%; opacity:0; }
.image-slideshow canvas.is-ready { opacity:1; }
.desktop { z-index:1; }