Sticky headers for scrollable grid table in Better Variations

wcbvp-sticky-table-headers.css

.wcbvp-scrollable {
  height: 500px;
}
.woocommerce div.product form.cart table {
  border-width: 0 0 1px;
  position: relative;
}
.wcbvp-table-wrapper thead th {
  position: sticky;
  top: 0;
  background: #E0E0E0;
}
.wcbvp-table-wrapper tbody th {
  position: sticky;
  left: 0;
  background: E0E0E0;
}