bootstrap-sortable.css

table.sortable span.sign {
    display: block;
    position: absolute;
    top: 50%;
    right: 5px;
    font-size: 12px;
    margin-top: -10px;
    color: #bfbfc1;
}

table.sortable span.arrow, span.reversed {
    border-style: solid;
    border-width: 5px;
    font-size: 0;
    border-color: #ccc transparent transparent transparent;
    line-height: 0;
    height: 0;
    width: 0;
    margin-top: -2px;
}

    table.sortable span.arrow.up {
        border-color: transparent transparent #ccc transparent;
        margin-top: -7px;
    }

table.sortable span.reversed {
    border-color: transparent transparent #ccc transparent;
    margin-top: -7px;
}

    table.sortable span.reversed.up {
        border-color: #ccc transparent transparent transparent;
        margin-top: -2px;
    }



table.sortable span.az:before {
    content: "a .. z";
}

table.sortable span.az.up:before {
    content: "z .. a";
}

table.sortable span.AZ:before {
    content: "A .. Z";
}

table.sortable span.AZ.up:before {
    content: "Z .. A";
}

table.sortable span._19:before {
    content: "1 .. 9";
}

table.sortable span._19.up:before {
    content: "9 .. 1";
}

table.sortable span.month:before {
    content: "jan .. dec";
}

table.sortable span.month.up:before {
    content: "dec .. jan";
}

table.sortable thead th {
    cursor: pointer;
    position: relative;
    top: 0;
    left: 0;
}

    table.sortable thead th:hover:not([data-defaultsort=disabled]) {
        background: #efefef;
    }

    table.sortable thead th div.mozilla {
        position: relative;
    }