body { font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif; line-height: 1.8; margin: 0; padding: 0; background-color: #f9f9f9; color: #333; } .container { max-width: 800px; margin: 20px auto; padding: 20px 30px; background-color: #fff; border-radiu…