.table-sort th {
    position: relative;
    cursor: pointer;
    padding-right: 20px;
}
.table-sort th::before, .table-sort th::after {
    content: "";
    height: 0;
    width: 0;
    position: absolute;
    border: 5px solid transparent;
    right: 0;
    top: 50%;
    transform: translate(-50%, -25%);
}
.table-sort th::before {
    border-bottom-color: #888;
    margin-top: -10px;
}
.table-sort th::after {
    border-top-color: #888;
    margin-top: 2px;
}