table thead th {
  cursor: pointer;
}

table thead th.nosort {
  cursor: initial;
}

.table_sortable thead th:after {
  display: inline-block;
  padding: 0 .25rem;
}

.table_sortable thead th.desc:after {
  content: '↑';
}

.table_sortable thead th.asc:after {
  content: '↓';
}