cards-using-bootstrap-4-and-css-grid-no-js for an explanation */

/* for demo purposes */
.card {
  margin: 10px 10px;
}

input[type='checkbox'] {
  display: none;
}

/* Flip Cards CSS */
.card-container {
  display: grid;
  perspective: 700px;
}

.card-flip {
  display: grid;
  grid-template: 1fr / 1fr;
  grid-template-areas: "frontAndBack";
  transform-style: preserve-3d;
  transition: all 0.7s ease;
}

.card-flip div {
  backface-visibility: hidden;
  transform-style: preserve-3d;
}

.front {
  grid-area: frontAndBack;
}

.back {
  grid-area: frontAndBack;
  transform: rotateY(-180deg);
}

input[type='checkbox']:checked + .card-container .card-flip {
  transform: rotateY(180deg);
}