table.dataTable thead th {
    /* ソートの矢印の画像を FontAwesome のアイコンに置き換える。*/
    position: relative;
    background-image: none !important;
}
table.dataTable thead > tr > th.sorting_asc,
table.dataTable thead > tr > th.sorting_desc,
table.dataTable thead > tr > th.sorting,
table.dataTable thead > tr > td.sorting_asc,
table.dataTable thead > tr > td.sorting_desc,
table.dataTable thead > tr > td.sorting {
    padding-right: 30px;
}
table.dataTable thead > tr > th:active,
table.dataTable thead > tr > td:active {
    outline: none;
}
table.dataTable thead .sorting,
table.dataTable thead .sorting_asc,
table.dataTable thead .sorting_desc,
table.dataTable thead .sorting_asc_disabled,
table.dataTable thead .sorting_desc_disabled {
    cursor: pointer;
    position: relative;
}
table.dataTable thead .sorting:before,
table.dataTable thead .sorting:after,
table.dataTable thead .sorting_asc:before,
table.dataTable thead .sorting_asc:after,
table.dataTable thead .sorting_desc:before,
table.dataTable thead .sorting_desc:after,
table.dataTable thead .sorting_asc_disabled:before,
table.dataTable thead .sorting_asc_disabled:after,
table.dataTable thead .sorting_desc_disabled:before,
table.dataTable thead .sorting_desc_disabled:after {
    position: absolute;
    bottom: 0.9em;
    display: block;
    opacity: 0.3;
}
table.dataTable thead .sorting:before,
table.dataTable thead .sorting_asc:before,
table.dataTable thead .sorting_desc:before,
table.dataTable thead .sorting_asc_disabled:before,
table.dataTable thead .sorting_desc_disabled:before {
    right: 1em;
    content: "\25B2";
}
table.dataTable thead .sorting:after,
table.dataTable thead .sorting_asc:after,
table.dataTable thead .sorting_desc:after,
table.dataTable thead .sorting_asc_disabled:after,
table.dataTable thead .sorting_desc_disabled:after {
    right: 0.1em;
    content: "\25BC";
}
table.dataTable thead .sorting_asc:before,
table.dataTable thead .sorting_desc:after {
    opacity: 1;
}
table.dataTable thead .sorting_asc_disabled:before,
table.dataTable thead .sorting_desc_disabled:after {
    opacity: 0;
}