@zebra-stripe-color: #f0f0f0;

/*
 * Border lines and zebra striping.
 */
table.results_round, th, td {
  border: 1px solid black;
  tr:nth-child(2n+1) {
    background-color: @zebra-stripe-color;
  }
}

@zebra-stripe-color: #f0f0f0;

/*
 * Border lines and zebra striping.
 */
table.results_round {
  th, td {
    border: 1px solid black;
  }
  td.mark_cell {
    width: 1em;
    text-align: center;
  }
  tr:nth-child(2n+1) {
    background-color: @zebra-stripe-color;
  }
}

Make width of the results table cells uniform.
Make width of the results table cells uniform.
