.product-purchase { display: grid; gap: .9rem; padding-block-start: .25rem; }
.product-purchase .store-button { inline-size: 100%; min-block-size: 3.4rem; font-size: 1rem; white-space: nowrap; }

@media (max-width: 30rem) {
  .product-purchase .store-button { min-inline-size: 0; inline-size: 100%; max-inline-size: 100%; white-space: normal; overflow-wrap: anywhere; }
}