div.tablecontainer {
  overflow-x: auto;
}

.table thead tr th:first-child,
.table tbody tr td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
}

/* Slightly higher z-index for header corner cell so it layers above both axes */
.table thead tr th:first-child {
  z-index: 2;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}