.slideshow {
  position: relative;
  width: 597px; /* match original SWF dimensions */
  height: 278px;
  overflow: hidden;
  margin: 0 auto;
}

.slideshow img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  animation: fade 44s infinite;
}

.slideshow img:nth-child(1)  { animation-delay: 0s; }
.slideshow img:nth-child(2)  { animation-delay: 4s; }
.slideshow img:nth-child(3)  { animation-delay: 8s; }
.slideshow img:nth-child(4)  { animation-delay: 12s; }
.slideshow img:nth-child(5)  { animation-delay: 16s; }
.slideshow img:nth-child(6)  { animation-delay: 20s; }
.slideshow img:nth-child(7)  { animation-delay: 24s; }
.slideshow img:nth-child(8)  { animation-delay: 28s; }
.slideshow img:nth-child(9)  { animation-delay: 32s; }
.slideshow img:nth-child(10) { animation-delay: 36s; }
.slideshow img:nth-child(11) { animation-delay: 40s; }

@keyframes fade {
  0%   { opacity: 0; }
  4%   { opacity: 1; }
  12%  { opacity: 1; }
  16%  { opacity: 0; }
  100% { opacity: 0; }
}