* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
  }
  
  .container {
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
  }
  
  span {
    font-size: 100px;
    padding: 10px;
    color: grey;
  }
  
  .btn {
    background: none;
    outline: none;
    border: 1px solid black;
    padding: 10px;
    border-radius: 10px;
    margin: 5px;
  }
  
  .up {
    animation: up 0.5s ease;
    position: relative;
  }
  
  .down {
    animation: down 0.5s ease;
    position: relative;
  }
  
  @keyframes up {
    0% {
      top: 0px;
    }
    50% {
      top: -20px;
    }
    100% {
      top: 0px;
    }
  }
  
  @keyframes down {
    0% {
      top: 0px;
    }
    50% {
      top: 20px;
    }
    100% {
      top: 0px;
    }
  }