body {
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  height: 100vh;
  background: black;
  overflow: hidden;
}

.image-container {
  position: relative;
  width: 200px;
  height: 200px;
  transform-style: preserve-3d;
  transform: perspective(1000px) rotateY(0deg);
  transition: transform 0.7s;
}

.image-container span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  transform: rotateY(calc(var(--i) * 45deg)) translateZ(400px);
}

.image-container span img {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
}

.btn-container {
  position: relative;
  width: 80%;
}

.btn {
  position: absolute;
  bottom: -80px;
  background: crimson;
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
}

#prev {
  left: 20%;
}

#next {
  right: 20%;
}

.btn:hover {
  filter: brightness(1.5);
}


@media only screen and (max-width: 900px) {
  .btn-container {
    position: absolute;
    width: 100%;
    left: 0;
    top: 0;
  }

  .btn {
    position: absolute;
    bottom: -80px;
    background: crimson;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
  }
}