.image-toggle {
  position: relative;
  width: 100%;    /* full width of container */
  height: auto;
  overflow: hidden;
}

.image-toggle img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  animation: toggleImages 8s infinite;
}

/* Second image shows later */
.image-toggle img:nth-child(2) {
  animation-delay: 4s;
}

@keyframes toggleImages {
  0%, 45% { opacity: 1; }
  55%, 100% { opacity: 0; }
}