.course {
  display: flex;
  justify-content: center;
  /* align-items: center; */
  min-height: 500px;
  /* background: #000000; */
}
.gallery {
  position: relative;
  width: 300px;
  height: 200px;
  transform-style: preserve-3d;
  animation: animate 30s linear infinite;
  animation-play-state: running;
}
.gallery:hover {
  animation-play-state: paused;
}
@keyframes animate {
  0% {
    transform: perspective(1000px) rotateY(0deg);
  }
  100% {
    transform: perspective(1000px) rotateY(360deg);
  }
}
.gallery span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform-origin: center;
  transform-style: preserve-3d;
  transform: rotateY(calc(var(--i) * 45deg)) translateZ(400px);
  -webkit-box-reflect: below 0px
    linear-gradient(transparent, transparent, #0004);
}
.gallery span img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  object-fit: cover;
  cursor: pointer;
}