td {
    height: 100px;
    width: 100px;
    font-weight: bold;
    font-size: 80px;
    font-family: sans-serif;
    text-align: center;
    vertical-align: middle;
  }

  #turn {
    font-weight: bold;
    font-size: 20px;
    font-family: sans-serif;
  }

  a {
    color: blue;
    text-decoration: none;
  }