.slideshow {
  position: relative;
  width: 100%;
  height: 400px;
  overflow: hidden;
}

.slideshow img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slideshow img.active {
  opacity: 1;
}