.woocommerce-product-categories a {
  color: inherit;
  display: inline-block;
  text-decoration: none;
  position: relative;
}
.woocommerce-product-categories a:not(:last-child) {
  padding-right: 10px;
  margin-right: 10px;
}
.woocommerce-product-categories a:not(:last-child)::after {
  content: "";
  height: 70%;
  border-right: 1px solid;
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
}