body { font-family: 'Segoe UI', 'Meiryo', sans-serif; line-height: 1.6; color: #333; max-width: 800px; margin: 0 auto; padding: 20px; background-color: #f9f9f9; } h1, h2, h3, h4 { color: #2c3e50; margin-top: 1.5em; margin-bottom: 0.5em; } h1 { font-size: 2em; text-align: center; } h2 { font-size: 1.…