src/app/core/table/table.scss

table {
  width: 100%;
  max-width: 100%;
  margin-bottom: 20px;
  border-collapse: collapse !important;
  background: darken(grey, 20);
  border: 1px solid darken(grey, 35);

  td, th {
  }
  > tbody > tr > th,
  > tfoot > tr > th,
  > thead > tr > td,
  > tbody > tr > td,
  > tfoot > tr > td {
    padding: 8px;
    line-height: 1.42857143;
    vertical-align: top;
    border-top: 1px solid #ddd;
  }
  > thead > tr > th {
    vertical-align: bottom;
    border-bottom: 2px solid #ddd;
    text-align: left;
    padding: 8px;
  }
  > caption + thead > tr:first-child > th,
  > colgroup + thead > tr:first-child > th,
  > thead:first-child > tr:first-child > th,
  > caption + thead > tr:first-child > td,
  > colgroup + thead > tr:first-child > td,
  > thead:first-child > tr:first-child > td {
    border-top: 0;
  }
  > tbody + tbody {
    border-top: 2px solid #ddd;
  }
  .table .table {
    background-color: #fff;
  }
}