@media (max-width:640px){form:has(textarea[placeholder="コメントを入力..."]){flex-direction:column;align-items:stretch}form:has(textarea[placeholder="コメントを入力..."])>div:first-child{width:100%}textarea[placeholder="コメントを入力..."]{resize:vertical;min-height:5rem;padding-left:.75rem;padding-right:.75rem}form:has(textarea[placeholder="コメントを入力..."])>div:last-child{justify-content:flex-end;width:100%}}