.single-product .fs-product-option-message {
  margin: 8px 0 16px;
  color: #b42318;
  font-size: 14px;
  line-height: 1.45;
}

.single-product .fs-product-option-message.is-error {
  color: #b42318;
  font-weight: 600;
}

.single-product .fs-product-option-message[hidden] {
  display: none;
}

.single-product .fs-product-purchase button.is-option-disabled,
.single-product .fs-product-purchase button:disabled {
  opacity: .5;
  cursor: not-allowed;
}

.single-product .fs-product-purchase select[aria-invalid="true"] {
  border-color: #b42318;
  box-shadow: 0 0 0 1px #b42318;
}