quantity-calculator{
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 1rem;
}
quantity-calculator > *{
  flex: 1 1 auto;
}
quantity-calculator span.form.quantity,
quantity-calculator span.form.desired-quantity,
quantity-calculator span.form.product-length{
  display: flex;
  flex-direction: column;
  max-height: 100%;
}