* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
}

body {
  width: 100%;
  height: 100dvh;
  background: rgb(182, 182, 182);
  display: grid;
  place-content: center;
}

.card-container {
  width: 250px;
  height: 320px;
  perspective: 1000px;
}

.card-container .card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: all .6s ease;
  -webkit-transition: transform .6s ease;
  -moz-transition: transform .6s ease;
  -ms-transition: transform .6s ease;
  -o-transition: transform .6s ease;
}

.card-container:hover .card {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
  -ms-transform: rotateY(180deg);
  -o-transform: rotateY(180deg);
}

.card .front,
.card .back {
  width: 100%;
  height: 100%;
  position: absolute;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 10px;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  -ms-border-radius: 10px;
  -o-border-radius: 10px;
}

.card .front {
  background: linear-gradient(45deg, blue, red);
}

.card .back {
  background: linear-gradient(45deg, rgb(255, 153, 0), rgb(255, 0, 128));
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
  -ms-transform: rotateY(180deg);
  -o-transform: rotateY(180deg);
}

@media (max-width: 450px) {
  .card-container {
    width: 200px;
    height: 250px;
  }
}