<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="./card.css">
</head>

<body>
  <div class="container">
    <div class="just">我在前</div>
    <div class="back">我在后</div>
  </div>
</body>

</html>

 

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-image: radial-gradient(circle 588px at 31.7% 40.2%,
      rgba(225, 200, 239, 1) 21.4%,
      rgba(163, 225, 233, 1) 57.1%);
  padding: 25px;
}

.container {
  width: 150px;
  height: 200px;
  position: relative;
  perspective: 1000px;
}

.just,
.back {
  width: 100%;
  height: 100%;
  position: absolute;
  backface-visibility: hidden;
  transition: transform 0.25s ease-in-out;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}

.just {
  transform: rotateY(0deg);
  background-image: linear-gradient(109.6deg,
      rgba(245, 56, 56, 1) 11.2%,
      rgba(234, 192, 117, 1) 78%);
}

.container:hover .just {
  transform: rotateY(180deg);
}

.back {
  transform: rotateY(-180deg);
  background-image: linear-gradient(117deg,
      rgba(123, 216, 96, 1) 39.2%,
      rgba(255, 255, 255, 1) 156.2%);
}

.container:hover .back {
  transform: rotateY(0deg);
}