.container { margin: 150px auto; max-width: 960px; }
    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: '↓';
    }