backgrid-grouped-columns.css

/*
  backgrid-grouped-columns
  https://github.com/WRidder/backgrid-grouped-columns

  Copyright (c) 2014 Wilbert van de Ridder and contributors
  Licensed under the MIT @license.
*/

.backgrid thead th {
  border-left: 1px solid #ddd;
  vertical-align: middle;
}

.backgrid thead th.select-all-header-cell {
  vertical-align: bottom;
}