body { background-color: #fff9e1; /* レモネードのようなやさしい黄色 */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; color: #333; line-height: 1.9; padding: 3em 1em; } .container { max-width: 720px; background: white; padding: 2.5em; margin: auto; box-shadow: 0 0 12px rgba(0, 0, 0, 0.08); border-ra…