body {
    font-family: sans-serif;
    background-color: #f7f8f9;
    color: #45505b;
  }
  
  .btn {
    background-color: transparent;
    color: #45505b;
    font-size: 30px;
    border: none;
    cursor: pointer;
  }
  
  .controls {
    display: flex;
    justify-content: center;
  }
  
  .btn:hover {
    color: #daa520;
  }
  
  .playing {
    text-align: center;
  }