body {
    /* Optional: background color, font tweaks */
  }
  
  .chord-table {
    border: 2px solid #666;
    border-collapse: collapse;
    margin-top: 1em;
    margin-bottom: 1em;
  }
  .chord-table td {
    border: 1px solid #666;
    width: 30px;
    height: 30px;
    text-align: center;
    vertical-align: middle;
    font-weight: bold;
  }
  .chord-table td:nth-child(n) {
    font-family: monospace;
  }