body {
    background-color: #000000;
    color: #ffffff;
  }
  
  #app {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  #playlist-area {
    width: 80%;
    height: 300px;
    overflow-y: auto;
    margin: 20px 0;
    border: 1px solid #ffffff;
    border-radius: 10px;
    padding: 10px;
  }
  
  #player-controls {
    display: flex;
    align-items: center;
  }
  
  button {
    margin: 0 10px;
  }

  .highlight {
    background-color: #444444;
  }

  input[type=range] {
    margin: auto;
    width: 80%;
  }

  #seek-area {
    margin: 10px 0;
    width: 90%;
    display: flex;
  }

  span#time-info {
    margin: auto;
}

#playlist-url-area {
    margin: 10px 0;
    width: 60%;
    text-align: center;
  }

  #playlist-url {
    width: 60%;
  }