.size-validation-message {
  display: none;
  width: 100%;
  margin: 0 0 6px;
  color: #df4d6b;
  font-size: 12px;
  line-height: 1.3;
}

.product-add-cart .input-group-add-cart .size-validation-message {
  order: -1;
  flex: 0 0 100%;
  width: 100%;
  margin: 0 0 6px;
}

.size-validation-message.is-visible {
  display: block;
}