body { background-color: #e6e6e6; /* 冷たいグレー */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 1.9; color: #333; padding: 3em 1em; } .container { max-width: 800px; margin: 0 auto; background-color: #ffffff; padding: 2.5em; border-radius: 8px; box-shadow: 0 0 15px rgba(0,0,…