html {
    height: 100%;
  }
  
  body {
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: linear-gradient(#403075, #882D61);
  }
  
  .piano {
    display: flex;
    position: relative;
    margin-left: 4px;
  }
  
  .white-key {
    width: 40px;
    height: 120px;
    background-color: #FFF;
    border: 4px solid black;
    border-radius: 0 0 6px 6px;
    margin-left: -4px;
    outline: none;
    cursor: pointer;
  }
  
  .white-key.active {
    background-color: #C0C0C0;
  }
  
  .black-key {
    position: absolute;
    width: 24px;
    height: 80px;
    background-image: linear-gradient(#000000, #303030);
    border: 3px solid black;
    border-radius: 0 0 2px 2px;
    outline: none;
    cursor: pointer;
  }
  
  .black-key.active {
    background-image: linear-gradient(#000000, #101010);
  }
  
  .Db4-key {
    left: 22px;
  }
  
  .Eb4-key {
    left: 58px;
  }
  
  .Gb4-key {
    left: 130px;
  }
  
  .Ab4-key {
    left: 166px;
  }
  
  .Bb4-key {
    left: 202px;
  }
  
  .Db5-key {
    left: 274px;
  }
  
  .Eb5-key {
    left: 310px;
  }