styles.css

.flip-card {
  perspective: 40rem;
  transition: z-index, transform 0.2s;
  transition-delay: 0.7s, 0s;
  z-index: 0;
  padding: 10px;
  text-decoration: none;
}
.flip-card-inner {
  display: flex;
  transform-style: preserve-3d;
  transition: transform 0.5s;
  transform-origin: center right;
  border-radius: 0.25rem;
  flex: 1;
  width: 250px;
  height: 250px;
  margin: auto;
  text-align: center;
  box-shadow: 0 -1px 1px rgba(0, 0, 0, 0.04), 0 2px 2px rgba(0, 0, 0, 0.04), 0 4px 4px rgba(0, 0, 0, 0.04), 0 8px 8px rgba(0, 0, 0, 0.04), 0 16px 16px rgba(0, 0, 0, 0.04);
}
body.hasHover .flip-card:hover, .flip-card.touchDevice-longpress {
  transition-delay: 0s;
  z-index: 1;
}
.flip-card:active {
  transform: scale(0.975);
}
.flip-card:hover .flip-card-inner, .flip-card:focus .flip-card-inner, .flip-card.touchDevice-longpress .flip-card-inner{
  transform: translateX(-250px) rotateY(-180deg);
}

.flip-card-front, .flip-card-back {
  backface-visibility: hidden;
  min-width: 100%;
  display: flex;
  align-items: center;
  background-color: white;
  box-sizing: border-box;
  border-radius: 0.25rem;
}
.flip-card-front {
  background-color: #818A91;
  color: black;
}
.flip-card-back {
  background-color: #bbb;
  color: black;
  transform: rotateY(-180deg) translateX(250px);
}