thead-dark

.table .thead-dark th {
  color: #fff;
  background-color: #343a40;
  border-color: #454d55;
}

@media print {
  /* 印刷字に利用するCSS　mediaで大きく括って、それぞれのタグの設定をする */
  *,
  *::before,
  *::after {
    text-shadow: none !important;
    box-shadow: none !important;
  }
  a:not(.btn) {
    text-decoration: underline;
  }
  abbr[title]::after {
    content: " (" attr(title) ")";
  }
  pre {
    white-space: pre-wrap !important;
  }
  pre,
  blockquote {
    border: 1px solid #adb5bd;
    page-break-inside: avoid;
  }
  thead {
    display: table-header-group;
  }
  tr,
  img {
    page-break-inside: avoid;
  }
  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }
  h2,
  h3 {
    page-break-after: avoid;
  }
  @page {
    size: a3;
  }
  body {
    min-width: 992px !important;
  }
  .container {
    min-width: 992px !important;
  }
  .navbar {
    display: none;
  }
  .badge {
    border: 1px solid #000;
  }
  .table {
    border-collapse: collapse !important;
  }
  .table td,
  .table th {
    background-color: #fff !important;
  }
  .table-bordered th,
  .table-bordered td {
    border: 1px solid #dee2e6 !important;
  }
  .table-dark {
    color: inherit;
  }
  .table-dark th,
  .table-dark td,
  .table-dark thead th,
  .table-dark tbody + tbody {
    border-color: #dee2e6;
  }
  .table .thead-dark th {
    color: inherit;
    border-color: #dee2e6;
  }
}