table.sortable th[aria-sort="descending"] span::after {
    content: "▼";
    color: currentcolor;
    font-size: 100%;
    top: 0;
}

table.sortable th[aria-sort="ascending"] span::after {
    content: "▲";
    color: currentcolor;
    font-size: 100%;
    top: 0;
}

table.sortable button {
    background: none;
    border: none;
    cursor: pointer;
}

table.show-unsorted-icon th:not([aria-sort]) button span::after {
    content: "↕";
    color: currentcolor;
    font-size: 100%;
    position: relative;
}