table.table > .fixed-header {
  top: 0;
  position: fixed;
  width: auto;
  display: table;
  z-index: 99;
}

.tbody-offset:before {
  content: " ";
  display: block;
}

table.table .table-body-offset > tr > td {
    display: none;
}

table.table .tbody-offset.table-body-offset > tr > td {
    display: table-cell;
}