h1,h2,p {
    text-align:center;
    padding:10px;
  }
  
  @keyframes hidden {
  
    0% {
      text-align:center;
      color:rgb(240,100,100);
    }
    
    100% {
      text-align:center;
      color:rgb(0,0,0);
    }
  }
  
  .answer {
    text-align:center;
    background-color:rgb(240,100,100);
    width:100px;
    height:52px;
    margin:auto;
    color:rgb(240,100,100);
    margin-bottom:10px;
    vertical-align:middle;
  }
  
  .answer:hover {
    width:100px;
    height:52px;
    text-align:center;
    margin:auto;
    animation-duration:3s;
    animation-name:hidden;
    vertical-align:middle;
  }
  
  .card {
    text-align:center;
    background-color:orange;
    width:200px;
    margin:auto;
  }