/* author:  https://codepen.io/raulperez0481/pen/yLWLePm
Raúl Pérez Caballero*/
body {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    height: 100vh;
    justify-content: center;
    background-color: black;
    overflow: hidden;
}

.image-container {
    width: 200px;
    height: 200px;
    transform-style: preserve-3d;
    transform: perspective(1000px) rotateY(0deg);
    transition: transform .7s;
}

.image-container span {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    transform: rotateY(calc(var(--i) * 90deg)) translateZ(400px);
}

.image-container span img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
  aspect-ratio: 1/1;
  -o-object-fit: cover;
     object-fit: cover;
  filter: grayscale(100%);

}

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

.btn {
  position: absolute;
  bottom: -140px;
  background-color: slateblue;
  color: white;
  border: none;
  padding: 10px 30px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 20px;
}

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

.image-container span img:hover {
  filter: none;
}

#prev {
    left: 20%;
}

#next {
    right: 20%;
}