form.cart {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
/* Make our inline availability notices small & red */
.wc-cb-availability.wc-cb-error {
    color: #d9534f;      /* a Bootstrap-style “danger” red */
    font-size: 0.85em;   /* a bit smaller than normal text */
    margin-top: 0.2em;
  }