.slideshow {
  background: #000;

  &, .slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }

  .slide {
    background-position: center;
    background-size: cover;
    opacity: 0;

    &.previous {
      z-index: 1;
      opacity: 1;
    }

    &.current {
      z-index: 2;
      animation: fadein 5000ms linear both;
    }
  }
}

@keyframes fadein {
  0%   { opacity: 0; }
  30%  { opacity: 1; }
  100% { opacity: 1; }
}