table {
    border-collapse: collapse;
    width: 50%;
    margin: 20px auto;
  }
  th, td {
    border: 1px solid black;
    padding: 8px;
    text-align: left;
  }
  #transaction-chart {
    margin: 20px auto;
    width: 80%;
    max-width: 600px;
  }