body { background-color: #e3f3e0; /* 緑系の優しい背景色 */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; color: #2b2b2b; line-height: 1.9; padding: 3em 1em; } .container { max-width: 740px; background: #ffffff; padding: 3em; margin: 0 auto; border-radius: 12px; box-shadow: 0 0 10px rgba(0, 64…