table.sortable th {
  position: relative;
}

table.sortable th button span {
  position: absolute;
  right: 4px;
}

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

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

/* Focus and hover styling */

table.sortable th:not([aria-sort]) button:focus span::after,
table.sortable th:not([aria-sort]) button:hover span::after {
  content: "▲";
  color: currentcolor;
  top: 0;
}