* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
  }
  
  .card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    width: 90%;
    max-width: 1000px;
  }
  
  .card {
    width: 100%;
    perspective: 1000px;
  }
  
  .card-inner {
    position: relative;
    width: 100%;
    height: 250px;
    transform-style: preserve-3d;
    transition: transform 0.6s;
  }
  
  .card:hover .card-inner {
    transform: rotateY(180deg);
  }
  
  .card-front,
  .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: #fff;
    font-size: 1.2rem;
    border-radius: 10px;
  }
  
  .card-front {
    background-color: #0073e6;
  }
  
  .card-back {
    background-color: #004080;
    transform: rotateY(180deg);
  }
  
  .card-back p {
    opacity: 0;
    transform: translateY(20px);
  }