.body {
  background-color: rgba(102, 100, 100, 0.1);;
}

.card {
    width: 200px;
    height: 200px;
    perspective: 600px;
    cursor: pointer;
  }
  
  .card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s;
  }
  
  .card-front,
  .card-back {
    width: 100%;
    height: 100%;
    position: absolute;
    backface-visibility: hidden;
  }
  
  .card-front {
    transform: rotateY(180deg);
  }
  
  .open .card-inner {
    transform: rotateY(180deg);
  }
  
  .match .card-inner {
    visibility: hidden;
  }
  
  .card-back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .card-image {
    width: 100%;
    height: 100%;
  }
  
  @media (min-width: 576px) {
    .card-deck {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      grid-gap: 10px;
    }
  }
  

  hr {
    margin-top: 1rem;
    margin-bottom: 1rem;
    border: 0;
    border-top: 4px solid rgba(34, 34, 34, 0.1);
  }