body {
  margin: 0;
  background-color: #fff;
}

#image-stack {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: -1;
}

#image-stack img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  object-fit: cover;
  opacity: 0;
  z-index: 1;
  transition: opacity .2s ease-in-out;
}

#image-stack img.active {
  opacity: 1;
  z-index: 2;
}

#image-stack img.last-active {
  opacity: 1;
  z-index: 1;
}

.scroll-trigger {
  height: 100vh;
  width: 100%;
}