body { background-color: #f2f2f2; /* 淡いグレー */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; color: #333; line-height: 1.9; padding: 3em 1.5em; } .container { max-width: 720px; background: #ffffff; padding: 2.5em 2em; margin: auto; box-shadow: 0 0 15px rgba(0,0,0,0.05); border-radius:…