* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
  }
  
  body {
    height: 130vh;
    display: flex;
 
    background-color: #E3F5DD;
    background-image: linear-gradient(to right, #FAFEE5 , #B6C241);
  }
  
  .memory-game {
    width: 640px;
    height: 640px;
    margin-right: auto;
    margin-left: auto;
    margin-top: 50px;
    display: flex;
    flex-wrap: wrap;
    perspective: 1000px;
  }
  
  .memory-card {
    width: calc(25% - 10px);
    height: calc(25% - 10px);
    margin: 5px;
    position: relative;
    transform: scale(1);
    transform-style: preserve-3d;
    transition: transform .5s;
    box-shadow: 1px 1px 1px rgba(0,0,0,.3);
  }
  
  .memory-card:active {
    transform: scale(0.97);
    transition: transform .2s;
  }
  
  .memory-card.flip {
    transform: rotateY(180deg);
  }
  
  .front-face,
  .back-face {
    width: 100%;
    height: 100%;
    padding: 10px;
    position: absolute;
    border-radius: 3px;
   
    backface-visibility: hidden;
    border: 2px solid white;
  }
  
  .front-face {
    transform: rotateY(180deg);
  }